Mackeeper 05 -Clean My Mac

Before continuing with safari, my mac wants me to Use Mackeeper 05 to clean my mac, improve security, and get a 100% performance boost. Is this a scam?

MacKeeper review:
acKeeper is a strange piece of software. There may be no other app as controversial in the Apple world. The application, which performs various janitorial duties on your hard drive, is loathed by a large segment of the Mac community. Check out any blog, site or forum that mentions it, and you’ll find hundreds of furious comments condemning MacKeeper and Zeobit, the company behind it. We discovered this ourselves earlier this month, when we offered a 50%-off deal on MacKeeper. Look at all those furious comments on the post.
The complaints about MacKeeper are all over the shop: It’s a virus. It holds your machine hostage until you pay up. It can’t be completely removed if you decide to delete it. Instead of speeding up your computer, it slows it down. It erases your hard drive, deletes photos, and disappears documents. There are protests about MacKeeper’s annual subscription fees. Zeobit is slammed for seedy marketing tactics. It runs pop-under ads, plants sock-puppet reviews and encourages sleazy affiliate sites, critics say.

Similar Messages

I have been gettin a message pop-up, Mackeeper, Clean your mac. Is this legit or should I just ignor it?

I have been getting a message pop-up when I log on to the internet. It reads, Mackeeper, Clean you mac. Is this a legit site from Apple or should I ignor it?

Paul_31 wrote:
And just in case it somehow managed to leech its way onto your Mac:
http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/
It's not really malware but it is extremely poorly written software. It has a fairly good user interface and is easy to use but, when the virus protection kicks in, it hogs all of the CPU resources and everything else slows to a crawl. Consider thirty seconds merely to open a large folder. I had it for several weeks and trashed it. Also, trashing it is easy. The old "drag to trash can" works just fine.

I see a pup-up Mackeeper (clean your Mac) what is this

When i surf the web a pup-up came and it is called Mackeeper (clean your Mac) i belive it is junck coul-you confir this.

And just a little reading to enlighten you further.
How to Uninstall MacKeeper. how to uninstall MacKeeper – updated |
And for more advice on this subject. Do not install MacKeeper: Apple Support Communities
Before you install anything, it is good policy to feed the program name into the search box (top right) and read what others say.

CLEAN YOUR MAC VIRUS

I am REALLY p...d ! Seven months after i installed "clean your mac" this virus/malware (wich i bought from APPLE!!) my computer is STILL infected with this virus! After installing this MACKEEPER/ZEOBIT .... firm, it my mac went so slow that i couldnt work with it anymore.
I got in touch with this east european based virus sellers helpdesk. I wanted to get rid of this virus program. The help i got consisted out of them trying to selling me more software.
After that i visited all the forums from Apple. Found i am one of the thousands victems they made. Tried some of the solutions i found here.
So i decided to reformat my hard disks and install all my programs again.
But STILL, whereever i go i get pop-up for this malware program. Some SO bad that the only choice you have is eigther click on oke to install this rubish again OR you have to close safari to get rid of this virus attach!!
I have been writing to Apple, who peddle this virus without any answer!! Safari, same thing
And now i am fat up !!
If Apple is in need of a couple of million more, no problem, they deserve it. But if, after EVERYTHING i have been reading here, still sell this malware/virus and dont CARE about their customers enough to so something about it, then it stops for me!!
I am shure that the Apple delete police will take this edit away again, and i will get another B....T email that "according to our rules......." but then we will take this a couple of steps further! We are now, just started, 1290 victims of this zeobit, and we are building a website about their policy how to push this virus thrue everybodys troath, and the lack of reaction to this from Apple.
And we will make SHURE that whenever someone in this world types in zeobit, mackeeper, clean your mac, we WILL be the number one hit in Google!!
Because now they REALLY p...d us off !!
PS...just to show how Apple thinks about their precious zeobit, i found out that any comnination of the words zeobit-mackeeper with words we use everyday, or in connection with organised crime is enough to refuse your edit.

Consider that people here have been helping and telling people and some wrote up their own User Tips and that Apple has a tech note, a link at the top of this and other forums, on how to avoid, not installl, and remove this type of ransomware malware.
https://discussions.apple.com/docs/DOC-3034
https://discussions.apple.com/docs/DOC-3201

A "MacKeeper" screen popped us and said we should clean our Mac - safe or not?

Am alert screen popped up and instructed me to clean our Mac with "MacKeeper". I closed it out not knowing what it was. Is is some sort of spam or does anyone know if it is safe?

MacKeeper is technically not what I would consider malware, but it's so close to malware I'd call it equivalent. See Beware MacKeeper.
(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

Are clean my mac and mackeeper legit? i am nervous as i got caught with mac defender. both of these programs i found on my mac tips and tricks app on dashboard and thought they would be approved. not sure and don't want to go ahead and use the samples etc

are clean my mac and mac keeper legit? i am nervous as i got caught in the macdefender scheme but these two i found on the mac tips and tricks app on dashboard so downloaded them but haven't used them yet. just don't want or need another mac defender hassle. thanks for any and all info in advance

once again thanks for more info. what i am still not clear on is if i haven't installed mackeeper can i just drag the icon of the open box [in one case] and the mackeeper icon in my app folder. i somehow downloaded two copies of mackeeper. clicked on one and it was put into my app folder. then i decided to use it and clicked on it and it started asking for email address and stuff. while i put an address in i didn't finish installing or hitting the button that would have probably got it completely installed.
checked the email address i gave it and no notice from them that i had completed the install or any other info. makes me hope it is still un installed.
given the givens should i use the apple help writer "how to uninstall mackeeper" on one or both of them or just hope that dragging them to the trash will suffice?
one of the many great things about apple is this support communities and folks like you and paul. have been rescued from my stupidity by others and you guys. thanks again

To clean my mac

macbook pro 4GB
S N w80500ox3atp
i wont to clean the mac-keeper dos not install

There are no cleaning programs for Mac that work, MacKeeper is awful, probably the worst example you could have found.
You don't need cleaners

I'm new to mac. Is there a need for Clean my Mac?

I'm new to mac. Is there a need to have Clean my Mac on my computer?

How to maintain a Mac
Make two or more backups of all your files
One backup is not enough to be safe. A copy of a backup doesn't count as another backup; all backups must be made directly from the original data.
Keep at least one backup off site at all times in case of disaster. Backing up to a cloud-data service is one way to accomplish this, but don't rely exclusively on such backups.
In fact, don’t rely exclusively on any single backup method, such as Time Machine.
If you get an indication that a backup has failed, don't ignore it.
Keep your software up to date
In the App Store or Software Update preference pane (depending on the OS version), you can configure automatic notifications of updates to OS X and other Mac App Store products. Some third-party applications from other sources have a similar feature, if you don’t mind letting them phone home. Otherwise you have to check yourself on a regular basis.
Keeping up to date is especially important for complex software that modifies the operating system, such as device drivers. Don't install such modifications unless they're absolutely necessary. Remove them when they are no longer needed. Before installing any Apple update, you must check that all system modifications that you use are compatible. Incompatibility with third-party software is by far the most common cause of difficulties with system updates.
Don't install crapware
...such as “themes,” "haxies," “add-ons,” “toolbars,” “enhancers," “optimizers,” “accelerators,” "boosters," “extenders,” “cleaners,” "doctors," "tune-ups," “defragmenters,” “firewalls,” "barriers," “guardians,” “defenders,” “protectors,” most “plugins,” commercial "virus scanners,” "disk tools," or "utilities." With very few exceptions, such stuff is useless or worse than useless. Above all, avoid any software that purports to change the look and feel of the user interface.
It's not much of an exaggeration to say that the whole "utility" software industry for the Mac is a fraud on consumers. The most extreme examples are the "CleanMyMac," "TuneUpMyMac," and “MacKeeper” scams, but there are many others.
As a rule, you should avoid software that changes the way other software works. Plugins for Photoshop and similar programs are an obvious exception to this rule. Safari extensions, and perhaps the equivalent for other web browsers, are a partial exception. Most are safe, and they're easy to get rid of if they don't work. Some may cause the browser to crash or otherwise malfunction. Some are malicious. Use with caution, and install only well-known extensions from relatively trustworthy sources, such as the Safari Extensions Gallery.
Only install software that is useful to you, not (as you imagine) to the computer. For example, a word processor is useful for writing. A video editor is useful for making movies. A game is useful for fun. But a "cache cleaner" isn't useful for anything. You didn't buy a computer so you could clean caches.
Never install any third-party software unless you know how to uninstall it. Otherwise you may create problems that are very hard to solve. Do not rely on "utilities" such as "AppCleaner" and the like that purport to remove software.
Don't install bad, conflicting, or unnecessary fonts
Whenever you install new fonts, use the validation feature of the built-in Font Book application to make sure the fonts aren't defective and don't conflict with each other or with others that you already have. See the built-in help and this support article for instructions.
Deactivate or remove fonts that you don't really need to speed up application launching.
Avoid malware
"Malware" is malicious software that circulates on the Internet. This kind of attack on OS X was once so rare that it was hardly a concern, but it's now increasingly common and dangerous.
There is some built-in protection against malware, but you can’t rely on it—the attackers are always at least one day ahead of the defense. You can’t rely on third-party "anti-virus" products for protection either. What you can rely on is common-sense awareness—not paranoia, which only makes you more vulnerable.
Never install software from an untrustworthy or unknown source. If in doubt, do some research. Any website that prompts you to install a “codec” or “plugin” that comes from the same site, or an unknown site, is untrustworthy. Software with a corporate brand, such as Adobe Flash Player, must come directly from the developer's website. No intermediary is acceptable, and don’t trust links unless you know how to parse them. Any file that is automatically downloaded from the web, without your having requested it, should go straight into the Trash. A web page that tells you that your computer has a “virus,” or that anything else is wrong with it, is a scam.
In OS X 10.7.5 or later, downloaded applications and Installer packages that have not been digitally signed by a developer registered with Apple are blocked from loading by default. The block can be overridden, but think carefully before you do so.
Because of recurring security issues in Java, it’s best to disable it in your web browsers, if it’s installed. Few websites have Java content nowadays, so you won’t be missing much. This action is mandatory if you’re running any version of OS X older than 10.6.8 with the latest Java update. Note: Java has nothing to do with JavaScript, despite the similar names. Don't install Java unless you're sure you need it. Most people don't.
Don't fill up your disk or SSD
A common mistake is adding more and more large files to your home folder until you start to get warnings that you're out of space, which may be followed in short order by a startup failure. This is more prone to happen on the newer Macs that come with an internal SSD instead of the traditional hard drive. The drive can be very nearly full before you become aware of the problem.
While it's not true that you should or must keep any particular percentage of space free, you should monitor your storage use and make sure you're not in immediate danger of using it up. According to Apple documentation, you need at least 9 GB of free space on the startup volume for normal operation.
If storage space is running low, use a tool such as OmniDiskSweeper to explore the volume and find out what's taking up the most space. Move seldom-used large files to secondary storage.
Relax, don’t do it
Besides the above, no routine maintenance is necessary or beneficial for the vast majority of users; specifically not “cleaning caches,” “zapping the PRAM,” "resetting the SMC," “rebuilding the directory,” "defragmenting the drive," “running periodic scripts,” “dumping logs,” "deleting temp files," “scanning for viruses,” "purging memory," "checking for bad blocks," "testing the hardware," or “repairing permissions.” Such measures are either completely pointless or are useful only for solving problems, not for prevention.
To use a Mac effectively, you have to free yourself from the Windows mindset that every computer needs regular downtime for maintenance such as "defragging" and "registry cleaning." Those concepts do not apply to the Mac platform.
A well-designed computing device is not something you should have to think about much. It should be an almost transparent medium through which you communicate, work, and play. If you want a machine that needs a lot of attention just to keep going, use a PC, or collect antique cars.
The very height of futility is running an expensive third-party application called “Disk Warrior” when nothing is wrong, or even when something is wrong and you have backups, which you must have. Disk Warrior is a data-salvage tool, not a maintenance tool, and you will never need it if your backups are adequate. Don’t waste money on it or anything like it.

Is it necessary to clean a Mac?

Is it necessary to clean a Mac?

How to maintain a Mac
1. Make redundant backups, keeping at least one off site at all times. One backup is not enough. Don’t back up your backups; make them independent of each other. Don’t rely completely on any single backup method, such as Time Machine. If you get an indication that a backup has failed, don't ignore it.
2. Keep your software up to date. In the Software Update preference pane, you can configure automatic notifications of updates to OS X and other Mac App Store products. Some third-party applications from other sources have a similar feature, if you don’t mind letting them phone home. Otherwise you have to check yourself on a regular basis. This is especially important for complex software that modifies the operating system, such as device drivers. Before installing any Apple update, you must check that all such modifications that you use are compatible.
3. Don't install crapware, such as “themes,” "haxies," “add-ons,” “toolbars,” “enhancers," “optimizers,” “accelerators,” “extenders,” “cleaners,” "tune-ups," “defragmenters,” “firewalls,” "barriers," “guardians,” “defenders,” “protectors,” most “plugins,” commercial "virus scanners,” "disk tools," or "utilities." With very few exceptions, this stuff is useless, or worse than useless.
The more actively promoted the product, the more likely it is to be garbage. The most extreme example is the “MacKeeper” scam.
As a rule, the only software you should install is that which directly enables you to do the things you use a computer for — such as creating, communicating, and playing — and does not modify the way other software works. Use your computer; don't fuss with it.
Never install any third-party software unless you know how to uninstall it. Otherwise you may create problems that are very hard to solve.
The free anti-malware application ClamXav is not crap, and although it’s not routinely needed, it may be useful in some environments, such as a mixed Mac-Windows enterprise network.
4. Beware of trojans. A trojan is malicious software (“malware”) that the user is duped into installing voluntarily. Such attacks were rare on the Mac platform until sometime in 2011, but are now increasingly common, and increasingly dangerous.
There is some built-in protection against downloading malware, but you can’t rely on it — the attackers are always at least one day ahead of the defense. You can’t rely on third-party protection either. What you can rely on is common-sense awareness — not paranoia, which only makes you more vulnerable.
Never install software from an untrustworthy or unknown source. If in doubt, do some research. Any website that prompts you to install a “codec” or “plugin” that comes from the same site, or an unknown site, is untrustworthy. Software with a corporate brand, such as Adobe Flash Player, must be acquired directly from the developer. No intermediary is acceptable, and don’t trust links unless you know how to parse them. Any file that is automatically downloaded from a web page without your having requested it should go straight into the Trash. A website that claims you have a “virus,” or that anything else is wrong with your computer, is rogue.
In OS X 10.7.5 or later, downloaded applications and Installer packages that have not been digitally signed by a developer registered with Apple are blocked from loading by default. The block can be overridden, but think carefully before you do so.
Because of recurring security issues in Java, it’s best to disable it in your web browsers, if it’s installed. Few websites have Java content nowadays, so you won’t be missing much. This action is mandatory if you’re running any version of OS X older than 10.6.8 with the latest Java update. Note: Java has nothing to do with JavaScript, despite the similar names. Don't install Java unless you're sure you need it. Most users don't.
5. Don't fill up your boot volume. A common mistake is adding more and more large files to your home folder until you start to get warnings that you're out of space, which may be followed in short order by a boot failure. This is more prone to happen on the newer Macs that come with an internal SSD instead of the traditional hard drive. The drive can be very nearly full before you become aware of the problem. While it's not true that you should or must keep any particular percentage of space free, you should monitor your storage consumption and make sure you're not in immediate danger of using it up. According to Apple documentation, you need at least 9 GB of free space on the startup volume for normal operation.
If storage space is running low, use a tool such as the free application OmniDiskSweeper to explore your volume and find out what's taking up the most space. Move rarely-used large files to secondary storage.
6. Relax, don’t do it. Besides the above, no routine maintenance is necessary or beneficial for the vast majority of users; specifically not “cleaning caches,” “zapping the PRAM,” "resetting the SMC," “rebuilding the directory,” "defragmenting the drive," “running periodic scripts,” “dumping logs,” "deleting temp files," “scanning for viruses,” "purging memory," "checking for bad blocks," or “repairing permissions.” Such measures are either completely pointless or are useful only for solving problems, not for prevention.
The very height of futility is running an expensive third-party application called “Disk Warrior” when nothing is wrong, or even when something is wrong and you have backups, which you must have. Disk Warrior is a data-salvage tool, not a maintenance tool, and you will never need it if your backups are adequate. Don’t waste money on it or anything like it.

I just uninstall mackeeper from my mac, but i don't know if i have to do more stuff after it???

hey, I am very new on computers stuff and i thought mackeeper was safe, so I installed a free version first and before i buy it, my boyfriend did some research and we read i should have not installed it, it is not safe, i uninstalled it but i do not if i have to do something else after it... can someone help me please?

MAC_Man_TX wrote:
I have used MACKeeper since early 2011. I think it is a great program if used properly it can save you a lot of headaches.
Nonsense! It does not solve any problems. It is a scam product, that uses scare tactics to get you to buy it. In my testing on a clean, unmodified Mac OS X system that had been running for less than an hour total, it found "critical" issues and recommended the removal of over 1,500 files.
MacKeeper is currently the subject of two separate class-action lawsuits alleging fraud. It absolutely should not be used!

Should i install clean my mac?

Is it wise to install Clean My Mac or a similar product on a MacBook Pro? Is it necessary? Is it useful? Is it harmful?

I would like to concur with 71.
In my testing of the so called "cleanup" apps, I find them to either be worthless or dangerous with a few like MacKeeper to be both worthless and dangerous at the same time.
They are something to be avoided.
The only thing they are good for is lining the vendors' pockets with gold.
Allan

CLEAN MY MAC

Does anyone have any input on the Clean My Mac App ? Does it really work correctly or is it like MacKeeper? I have a late 2009 IMac running Snow Leopard 10.6.8 , 4 gigs of ram with a 1tb hd . Would also like to know what thoughts are on Apple Delete. I have some aplications that i would like to delete and would like to make sure that I delete all files associated with these apps.

rkaufmann87 wrote: OS X is not like MS Windows that needs third party utilities to run well. Everything needed is already built into OS X. Onyx and utilities like it ONLY do one thing, that is to bring all the tools already in OS X into one place.
No, that is really not accurate and is a bit misleading. While it is true that Onyx or other maintenance utilities use a GUI wrapper for some OSX or Unix functions, not all of these are run automatically -- which is partly what you appear to be suggesting -- or are present as tools in OSX. While I agree that Onyx or Applejack or any of the others are not generally needed for regular maintenance, a few of the recommended ones (above) do have their place. E.g., just to name several in Onyx, rebuild the LaunchServices Database and rebuild the dyld shared cache, which can be run either through a Unix command or through a GUI wrapper like Onyx. And there are times when one wants to clear out caches as a troubleshooting step. There is no native tool in OSX to do this. In addition, if the computer is shut down at night, the periodic scripts will never run. This can be done easily through a Unix command, but also through Onyx, if one is Terminal shy.

What about Clean My Mac 3?

What are thoughts about Clean My Mac 3?

How to maintain a Mac
1. Make redundant backups, keeping at least one off site at all times. One backup is not enough. Don’t back up your backups; all should be made directly from the original data. Don’t rely completely on any single backup method, such as Time Machine. If you get an indication that a backup has failed, don't ignore it.
2. Keep your software up to date. In the App Store or Software Update preference pane (depending on the OS version), you can configure automatic notifications of updates to OS X and other Mac App Store products. Some third-party applications from other sources have a similar feature, if you don’t mind letting them phone home. Otherwise you have to check yourself on a regular basis.
Keeping up to date is especially important for complex software that modifies the operating system, such as device drivers. Before installing any Apple update, you must check that all such modifications that you use are compatible. Incompatibility with third-party software is by far the most common cause of trouble with system updates.
3. Don't install crapware, such as “themes,” "haxies," “add-ons,” “toolbars,” “enhancers," “optimizers,” “accelerators,” "boosters," “extenders,” “cleaners,” "doctors," "tune-ups," “defragmenters,” “firewalls,” "barriers," “guardians,” “defenders,” “protectors,” most “plugins,” commercial "virus scanners,” "disk tools," or "utilities." With very few exceptions, such stuff is useless or worse than useless. Above all, avoid any software that purports to change the look and feel of the user interface.
The more heavily promoted the product, the more likely it is to be garbage. The most extreme example is the “MacKeeper” scam.
As a rule, the only software you should install is that which directly enables you to do the things you use a computer for — such as creating, communicating, and playing — and does not modify the way other software works. Use your computer; don't fuss with it.
Safari extensions, and perhaps the equivalent for other web browsers, are a partial exception to the above rule. Most are safe, and they're easy to get rid of if they don't work. Some may cause the browser to crash or otherwise malfunction. Some are malicious. Use with caution, and install only well-known extensions from relatively trustworthy sources, such as the Safari Extensions Gallery.
Never install any third-party software unless you know how to uninstall it. Otherwise you may create problems that are very hard to solve.
4. Beware of malware. Malware is malicious software that circulates on the Internet. This kind of attack on OS X used to be so rare that it was hardly a concern, but it's now increasingly common, and increasingly dangerous.
There is some built-in protection against downloading malware, but you can’t rely on it — the attackers are always at least one day ahead of the defense. You can’t rely on third-party protection either. What you can rely on is common-sense awareness — not paranoia, which only makes you more vulnerable.
Never install software from an untrustworthy or unknown source. If in doubt, do some research. Any website that prompts you to install a “codec” or “plugin” that comes from the same site, or an unknown site, is untrustworthy. Software with a corporate brand, such as Adobe Flash Player, must come directly from the developer's website. No intermediary is acceptable, and don’t trust links unless you know how to parse them. Any file that is automatically downloaded from the web, without your having requested it, should go straight into the Trash. A web page that tells you that your computer has a “virus,” or that anything else is wrong with it, is a scam.
In OS X 10.7.5 or later, downloaded applications and Installer packages that have not been digitally signed by a developer registered with Apple are blocked from loading by default. The block can be overridden, but think carefully before you do so.
Because of recurring security issues in Java, it’s best to disable it in your web browsers, if it’s installed. Few websites have Java content nowadays, so you won’t be missing much. This action is mandatory if you’re running any version of OS X older than 10.6.8 with the latest Java update. Note: Java has nothing to do with JavaScript, despite the similar names. Don't install Java unless you're sure you need it. Most people don't.
5. Don't fill up your boot volume. A common mistake is adding more and more large files to your home folder until you start to get warnings that you're out of space, which may be followed in short order by a boot failure. This is more prone to happen on the newer Macs that come with an internal SSD instead of the traditional hard drive. The drive can be very nearly full before you become aware of the problem.
While it's not true that you should or must keep any particular percentage of space free, you should monitor your storage use and make sure you're not in immediate danger of using it up. According to Apple documentation, you need at least 9 GB of free space on the startup volume for normal operation.
If storage space is running low, use a tool such as OmniDiskSweeper to explore the volume and find out what's taking up the most space. Move seldom-used large files to secondary storage.
6. Relax, don’t do it. Besides the above, no routine maintenance is necessary or beneficial for the vast majority of users; specifically not “cleaning caches,” “zapping the PRAM,” "resetting the SMC," “rebuilding the directory,” "defragmenting the drive," “running periodic scripts,” “dumping logs,” "deleting temp files," “scanning for viruses,” "purging memory," "checking for bad blocks," "testing the hardware," or “repairing permissions.” Such measures are either completely pointless or are useful only for solving problems, not for prevention.
Let go of the Windows mentality that every computer needs regular maintenance such as "defragging" and "registry cleaning." Those concepts do not apply to the Mac platform.
The very height of futility is running an expensive third-party application called “Disk Warrior” when nothing is wrong, or even when something is wrong and you have backups, which you must have. Disk Warrior is a data-salvage tool, not a maintenance tool, and you will never need it if your backups are adequate. Don’t waste money on it or anything like it.

How useful is clean my mac

How useful and secure is"clean my Mac"?

How to maintain a Mac
1. Make redundant backups, keeping at least one off site at all times. One backup is not enough. Don’t back up your backups; make them independent of each other. Don’t rely completely on any single backup method, such as Time Machine. If you get an indication that a backup has failed, don't ignore it.
2. Keep your software up to date. In the Software Update preference pane, you can configure automatic notifications of updates to OS X and other Mac App Store products. Some third-party applications from other sources have a similar feature, if you don’t mind letting them phone home. Otherwise you have to check yourself on a regular basis. This is especially important for complex software that modifies the operating system, such as device drivers. Before installing any Apple update, you must check that all such modifications that you use are compatible.
3. Don't install crapware, such as “themes,” "haxies," “add-ons,” “toolbars,” “enhancers," “optimizers,” “accelerators,” “extenders,” “cleaners,” "doctors," "tune-ups," “defragmenters,” “firewalls,” "barriers," “guardians,” “defenders,” “protectors,” most “plugins,” commercial "virus scanners,” "disk tools," or "utilities." With very few exceptions, this stuff is useless, or worse than useless.
The more actively promoted the product, the more likely it is to be garbage. The most extreme example is the “MacKeeper” scam.
As a rule, the only software you should install is that which directly enables you to do the things you use a computer for — such as creating, communicating, and playing — and does not modify the way other software works. Use your computer; don't fuss with it.
Never install any third-party software unless you know how to uninstall it. Otherwise you may create problems that are very hard to solve.
The free anti-malware application ClamXav is not crap, and although it’s not routinely needed, it may be useful in some environments, such as a mixed Mac-Windows enterprise network.
4. Beware of trojans. A trojan is malicious software (“malware”) that the user is duped into installing voluntarily. Such attacks were rare on the Mac platform until sometime in 2011, but are now increasingly common, and increasingly dangerous.
There is some built-in protection against downloading malware, but you can’t rely on it — the attackers are always at least one day ahead of the defense. You can’t rely on third-party protection either. What you can rely on is common-sense awareness — not paranoia, which only makes you more vulnerable.
Never install software from an untrustworthy or unknown source. If in doubt, do some research. Any website that prompts you to install a “codec” or “plugin” that comes from the same site, or an unknown site, is untrustworthy. Software with a corporate brand, such as Adobe Flash Player, must be acquired directly from the developer. No intermediary is acceptable, and don’t trust links unless you know how to parse them. Any file that is automatically downloaded from a web page without your having requested it should go straight into the Trash. A website that claims you have a “virus,” or that anything else is wrong with your computer, is rogue.
In OS X 10.7.5 or later, downloaded applications and Installer packages that have not been digitally signed by a developer registered with Apple are blocked from loading by default. The block can be overridden, but think carefully before you do so.
Because of recurring security issues in Java, it’s best to disable it in your web browsers, if it’s installed. Few websites have Java content nowadays, so you won’t be missing much. This action is mandatory if you’re running any version of OS X older than 10.6.8 with the latest Java update. Note: Java has nothing to do with JavaScript, despite the similar names. Don't install Java unless you're sure you need it. Most users don't.
5. Don't fill up your boot volume. A common mistake is adding more and more large files to your home folder until you start to get warnings that you're out of space, which may be followed in short order by a boot failure. This is more prone to happen on the newer Macs that come with an internal SSD instead of the traditional hard drive. The drive can be very nearly full before you become aware of the problem. While it's not true that you should or must keep any particular percentage of space free, you should monitor your storage consumption and make sure you're not in immediate danger of using it up. According to Apple documentation, you need at least 9 GB of free space on the startup volume for normal operation.
If storage space is running low, use a tool such as the free application OmniDiskSweeper to explore your volume and find out what's taking up the most space. Move rarely-used large files to secondary storage.
6. Relax, don’t do it. Besides the above, no routine maintenance is necessary or beneficial for the vast majority of users; specifically not “cleaning caches,” “zapping the PRAM,” "resetting the SMC," “rebuilding the directory,” "defragmenting the drive," “running periodic scripts,” “dumping logs,” "deleting temp files," “scanning for viruses,” "purging memory," "checking for bad blocks," or “repairing permissions.” Such measures are either completely pointless or are useful only for solving problems, not for prevention.
The very height of futility is running an expensive third-party application called “Disk Warrior” when nothing is wrong, or even when something is wrong and you have backups, which you must have. Disk Warrior is a data-salvage tool, not a maintenance tool, and you will never need it if your backups are adequate. Don’t waste money on it or anything like it.

I keep getting error message, "can't open application PACE because PowerPC applications are no longer supported." I've run Clean My Mac and I still get the error.

I keep getting error message, "can't open application PACE because PowerPC applications are no longer supported." I've run Clean My Mac and I still get the error.

Use the Finder "Go" menu while holding down the option key to expose your User / Library folder.
Look in the Application Support folder for PACE items and delete them.

Mackeeper 05 -Clean My Mac

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