HP Laser Printer message saying "System Extension Cannot Be Used"

I am trying to install a laserjet printer but while it was installing, a message came up which read, "'System Extension Cannot Be Used' The system extension, "/System/Library/Extensions/AppleUSBEthernetHost.kext' was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update." We tried the printer out and it seems to work, however, the scanner does not work.
When I got this Mac Book Pro, 4 or 5 years ago, I had a HP inkjet printer which I can never use the scanning feature because it did not work. I don't remember what the error message was, but it never worked when I tried to use it. I wonder if the problems with scanning have to do with this particular file that is supposedly installed wrongly.
We tested the printer out and it worked fine. But no scanning. It can't find the scanner.
My computer is Mac OS X - 10.6.8. The printer is HP Laserjet Pro 200 color MFP.
Anyone have any idea what I should do to fix this error? Thanks.

Open the Script Editor in the /Applications/AppleScript/ folder, copy and paste the entire following line into it, and press the Run button:
do shell script "chown -R root:wheel /System/Library/Extensions/AppleUSBEthernetHost.kext" with administrator privileges
If it doesn’t work, choose Go to Folder from the Finder's Go menu, provide /System/Library/Extensions/ as the path, throw the AppleUSBEthernetHost.kext item away, and reinstall iTunes.
(118910)

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HT1151 I keep getting an error message when installing new software that says "System extension cannot be used /system/library/extension/IoFireWireWDHID.kext was installed improperly" I have no idea what this means and all of my software seems to install

I keep getting an error message when installing new software that says "System extension cannot be used /system/library/extension/IoFireWireWDHID.kext was installed improperly" I have no idea what this means and all of my software seems to install okay

Hello Valerie Anderson,
I'm Harry from Norton Support team. Please check the information provided in a similar thread here:
https://discussions.apple.com/message/21854775#21854775
Let me know if this helps.
Thanks!
Harry

Message displayed: System extension cannot be used The system extension "//System/Library/Extensions/AppleUSBEthernetHost.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.

Received following message during installation of an iTunes update today (9/16/14): System extension cannot be used. The system extension “//System/Library/Extensions/AppleUSBEthernetHost.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update. What is to be done about it?

Thanks for the reply. I'm not experienced in the inner workings of the iMac system and its programs, so please follow my train of thought as I try to find and understand your reply.
You wrote that I should check out "Please see - AppleUSBEthernetHost.kext error on installing iTunes update" and I did so.
There I found your reply of 9/1014 7:06 PM to j'ski stating: "There is a larger thread here which you may want to follow - system extension cannot be used AppleUSBEthernetHost.kext ."
And an earlier Post by Greg Earle of 9/10/14 5:57 PM stating: " You would have been better off doing open /System/Library/Extensions and then finding the AppleUSBEthernetHost.kext kernel extension icon in the Finder window that came up and moving it to the Trash."
And a subsequent Post on 9/15/14 at 2:59 PM by Rob Maurer stating: "This method worked perfectly for me. I am on a Mac Pro running Mountain Lion. Dragged the kext file to trash (I use EasyFind. Found the file, Revealed in Finder, dragged to Trash, entered admin password when requested). Downloaded iTunes 11.4 from the website. Installed from that download. Checked for that kext file in EasyFind again and found it had a creation date of 7/29/14 (the trashed one had a creation date from 2009). No more error messages. ITunes opens fine. Everything good. Will not update on my MacBook Pro until they fix this issue.
All of which leave me wondering - what is your answer/recommendation? Do I drag the kext file to trash, download iTunes 11.4 from the website and install it from that download, check for that kext file again to see if it has a later date than the initial one? And, if so, seed if iTunes opens okay or not? And if so, do not update iTunes again until Apple fixes whatever is wrong?

Splash screen says "System extension cannot be used The system extension "/System/Library/Extensions/PulseDriver.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update. How to fix?

Please help!
After installing iTunes 11.0.1 I got a splash screen that appears after all updates. The screen reads:
System extension cannot be used
"The system extension “/System/Library/Extensions/PulseDriver.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update."
Question: How do I re-install or replace this file?
Jim

I submitted the above question, later finding that it has been answered by Buller already. No one need reply as Buller's answer seems to solve the problem for others, and I'll try that.
Jim

100's of ' System extension cannot be used ' messages and system instability

Ok, I was trying to change the folder background on my home drive in finder.
I Changed the background in the Home drive and then went to 'Show info' and clicked 'apply to enclosed items' in 'sharing and permissions'
Ive had over 300 messages saying
'System extention cannot be used
The system extension "/system/library/Extensions/*****.kext"
was installed improperly and cannot be used
Please try reinstalling it, or contact the products vendor for an update.
examples include
AppleStorageDrivers.kext/Contents/PlugIns/MKE-SR-8171.kext
/System/Library/Extensions/AppleUSBTopCase.kext
/System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCButto ns.kext
/System/Library/Extensions/BootCache.kext
etc etc
I tried repairing permissions, but that doesnt work. Im constantly getting random permission error messages, my plugins in logic dont work properly and are generating error messages, audio wierdness in logic, all kinds of stuff
oh if i could turn back the clock. What have i done?, and how can i fix it?

Hi, thanks for your reply, and sorry if my description was unclear. I started by changing the folder background here:
Then I went here (apply to enclosed items). You can see on the shot ive taken, permissions state 'you can only read' , and under name 'fetching'.
Then, after a few minutes, i got around 300 of this (**** refers to all the 300 different filenames that came up)
'System extention cannot be used
The system extension "/system/library/Extensions/*****.kext"
was installed improperly and cannot be used
Please try reinstalling it, or contact the products vendor for an update.

System extension cannot be used, now no AirPort Card Installed?!?!?!?!

I have had my MBP for some time now and the other day it went into a kernel panic and after having to go through all the processes to recover it including restoring from the time capsule so that it doesn't take over 10 mins to start up an error message came up saying;
"*System extension cannot be used*"
"the system extension '/System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AppleAirPortBrc m4311.kext' was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update"
Now i cant use my airport card at all, it says that there is no airport card installed and I have spent hours on the phone to apple, done the option + command + r + p thing and had to restore my whole system off my TC with the backup disks and all.
Plz plz plz plz help, i just want it back the way it was, this is so annoying
Message was edited by: TBlank

I had the same problem. It happened to me after I updated to 10.5.6. I didn't notice the problem until I rebooted a few days later. I reinstalled the system from disk and then realized that even though it took almost an hour it didn't really install anything. So I deleted the whole /System/Library/Extensions/IO80211Family.kext and reinstalled the system again. This time it worked

"System extension cannot be used" when updating iTunes

Every time I update iTunes through the standard Software Update, I get multiple messages towards the end of the installation saying:
*System extension cannot be used*
The system extension "/System/Library/Extensions/IOFireWireWDHID.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.
This only happens when updating iTunes. Any ideas? Thank you in advance!

Hello MaxGraphics,
You both may want to read this article before proceeding. It does give you an idea about kext files and how to handle them.
http://www.ihackintosh.com/2009/02/what-is-kextwhere-is-kext-how-to-install-kext /
Hope this helps.

Changed Permission Settings: "System extension cannot be used"

I was having some weird problems with file sharing on my network recently, so I tried changing around some of the permissions on my drives to see if I could resolve it. For some reason I was getting messages saying I didn't have permission to copy files from one computer to another on my network. This seemed to come on randomly as we have been doing file transfers this way for quite some time now. I looked at our file sharing preferences in the System Preference's and added all 4 drives from my Mac Pro in there and made sure that my username had full read and write capabilities. I then tried logging into my Mac Pro from my iMac, just like I've done in the past, and I was still unable to copy the files. So I removed all the folders and turned off file sharing. I then clicked 'Get Info' for my main Macintosh HD and tried changing the permission settings there. I clicked the option to make my username the owner, and then I clicked 'Apply to enclosed items...' and this brought up a progress bar that I let go for about 10 minutes. Then I got a pop-up error message stating "System extension cannot be used" and had an extension path listed underneath, saying it was installed improperly and cannot be used. This happens an endless amount of times. It seems to be giving me this message for every single extension on the computer. If I hold down enter the pop-ups just keep coming with different extensions listed.
I hope someone with some insight on how permissions work in OS X Lion can give me some advice on how to resolve, and possible the correct way I should be setting up sharing if I've been doing wrong all this time. What strikes me as odd is that I never had any issues with sharing anything up until about a week or so ago, and I can't remember if there were any system updates that I installed that might have something to do with this.
Any help is much appreciated, thanks!

I had this problem recently in addition to my laptop getting stuck on the Apple logo and spinning icon. It took me a long to time to work through it so I thought I would share what I did to make it easier for others.
The best thing to do when having permission problems is to do a 'disk permissions repair'. You can do this using the disk utility app found in your applications/utilities folder. This will attempt to rewrite all the permissions that were incorrectly set. When it is doing this it is common to get a message saying 'ACL...found and not expected...' do not go and delete these files. Its normal for this correction process to take more than 30 minutes, for me it took an hour.
If this proccess doesnt work for you than you can also try a disk repair.
If you can't boot using the normal disk you can also access this program through the recovery boot (holding Command-R of Option at startup), through the safe mode (holding Shift on start up) or through a recovery CD. You can also boot in a terminal type mode but this is a last ditch effort as a misspelt command could do more damage. personally, because I do not know what the commands I am using actually mean, I would recommend talking to a person at apple then using this approach.
Hope this helps

System Extension Cannot Be Used? How do I fix?

Hello
I recently updated to Mavericks using 10.9.4, and installed a Canon Pro 100 printer. Ever since I did this I am getting the following message.
"System extension cannot be used
The system extension “/System/Library/Extensions/IOFireWireMxBt.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update."
Also, what is "IOFirwWireMx.kext"? If I knew what is was, I would try to re-install it, as it suggests. But I don't know what this is referring to. How do I fix this?
Thanks for your help.
Oudlady

I'm afraid there is no simple solution without a backup of the Mac before 10.9 was installed. There are user tips that explain the process, but it will vary for each user depending on what is used on the Mac.
Apple: Restoring a previous OS X version
How to revert OS X back from Mavericks
I have seen that many users complain about 10.9 being slow/ worse than "whatever was installed before".
Personally I find it comparable in performance to other OS's.
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The basic options are to clean up the OS (find out how to uninstall all the old stuff) or to reinstall the OS without the old apps.
The process usually involves creating an EtreCheck report to show people here what is installed. From there you can either decide to backup your data & reinstall or attempt to clean out some older apps (assuming that is what is causing the trouble).
http://etresoft.com/etrecheck
It helps if you include descriptions of what the actual issues are, e.g. Finder takes x mins to open folders.
You will also want to make a full backup onto another disk. Do you know how to do that?
I'd suggest you mark this thread as solved & then create a new thread so that the topic is clear. Post a link to it from here if you want me & Kappy to see it

System Extension Cannot Be Used: Soundflower Error?

I've had this issue for a long time now and I never knew what started it, it just started happening one day.andomly get
Anyways, I randomly get this pop up message that says:
System extension cannot be used
The system extension "/System/Library/Extensions/Soundflower.kext" was installed improperly and cannot be used.
Please try reinstalling it, or contact the product's vendor for an update.
There's no reason or rhyme to when it happens. I think maybe the app Boom that boosts volumes sometimes triggers it, but its never 100%. Also I googled around and I've tried some things like that restart the computer and have it run the system check and it didnt fix it
If anyone can point me in the right direction on what this might be I'd be very appreciative.

Open the Script Editor in the /Applications/AppleScript/ folder and run the following:
do shell script "chown -R root:wheel /System/Library/Extensions/AppleUSBEthernetHost.kext" with administrator privileges
You may then need to restart the computer.
(113146)

2questions: system extension cannot be used and reinstalling updates

My error message on start up says:
*System extension cannot be used*
*The system extension “/System/Library/Extensions/SeratoScratchDriver.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update*
It appeared after I was in the middle of downloading software updates and my wireless dropped out. I downloaded them again to see if the error message would disappear once they were installed and then I got the never ending loading screen. I tried restarting and now it just starts up as normal with the error message still appearing. I also tried reinstalling serato scratch live. Any advice??
If I archive and reinstall leopard..which seems to be the best solution for the blue screen, will I lose any files? Do you think this might get rid of my error message as well?

That will happen if the kext is not owned by root and/or doesn't pass code signing verification. If an installer was interrupted then it probably didn't finish its job and you'll need to trash that bundle.

"System Extension cannot be used" when starting Parallels

I'm using Parallels Desktop 4.0 to provide a platform for Windows XP on my MacBook. It works very well, but since a recent update of the package, I have been getting a message on startup which says:
"System extension cannot be used
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I see from other discussions in this forum that this type of warning sometimes appears, but what does it mean generically - does anyone know? So far Parallels support has suggested a couple of things including reloading MacFUSE which I'd never heard of, but they are now suggesting it's a Mac OS problem. Could it be? I need some kind of steer as to what this means and what could have caused it

Hello MaxGraphics,
You both may want to read this article before proceeding. It does give you an idea about kext files and how to handle them.
http://www.ihackintosh.com/2009/02/what-is-kextwhere-is-kext-how-to-install-kext /
Hope this helps.

System extension cannot be used - rtl8187bl.kext

hi,
sometimes when i use system update i get this error message:
title: system extension cannot be used
message: the system extension "/System/Library/Extensions/RTL8187Bl.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.
i'm pretty sure its a driver for network device (ethernet or wifi), both of them works fine for me, and i have no idea how to update/reinstall drivers under MacOS.
any idea/tip/guess can help,
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See the following:
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Applications may create preference files that are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application. In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder. You can also check there to see if the application has created a folder. You can also delete the folder that's in the Applications Support folder. Again, they don't do anything but take up disk space once the application is trashed.
Some applications may install a startupitem or a Log In item. Startupitems are usually installed in the /Library/StartupItems/ folder and less often in the /Home/Library/StartupItems/ folder. Log In Items are set in the Accounts preferences. Open System Preferences, click on the Accounts icon, then click on the LogIn Items tab. Locate the item in the list for the application you want to remove and click on the "-" button to delete it from the list.
Some software use startup daemons or agents that are a new feature of the OS. Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.
If an application installs any other files the best way to track them down is to do a Finder search using the application name or the developer name as the search term. Unfortunately Spotlight will not look in certain folders by default. You can modify Spotlight's behavior or use a third-party search utility, Easy Find, instead. Download Easy Find at VersionTracker or MacUpdate.
Some applications install a receipt in the /Library/Receipts/ folder. Usually with the same name as the program or the developer. The item generally has a ".pkg" extension. Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications. Here is a selection:
AppZapper
Automaton
Hazel
CleanApp
Yank
SuperPop
Uninstaller
Spring Cleaning
Look for them at VersionTracker or MacUpdate.
For more information visit The XLab FAQs and read the FAQ on removing software.

System Extension Cannot Be Used message pop-up

I just upgraded from an iMac power pc to a new iMac with snow leopard. I have an HP Photosmart B8850 printer and uninstalled the previous software driver and installed updated software. The problem is that I get a warning box with the message [ System Extension Cannot Be Used. The system extension “/system/Library/Extensions/hp/photosmartb8800series.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the products vendor for an update.] It appears that Library/Extensions is empty. The printer seems to be working properly. Do I need the system extension? If not, how can I keep the warning box from popping up?

If you are looking in /Library/Extensions for this file as your message seems to indicate, you are looking in the wrong place. Go to your Finder's Go menu and select *Go to Folder...* then type in /system/Library/Extensions
Best of luck.

"system extension cannot be used" message upon startup

Ever since I upgraded OS 10.3.9 to Tiger on w/my newly purchased OS 10.4.6 from Apple, my 12" Powerbook G4 displays a yellow triangle containing an exclamation mark beside which is the message
*System extension cannot be used.*
The system extension "/Library/Extensions/VirtualPCOSServices.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.
I assume this refers to something about Virtual PC (which I no longer use) that I had on my hard drive before installing Tiger, and even though I've since upgraded to 10.4.10, the message continues to appear. Is there anything I can do before reinstalling 10.4.6, or is that indeed the best solution, and will that solve it?
Thanks in advance for any help out there. - Rick

If you are looking in /Library/Extensions for this file as your message seems to indicate, you are looking in the wrong place. Go to your Finder's Go menu and select *Go to Folder...* then type in /system/Library/Extensions
Best of luck.

HP Laser Printer message saying "System Extension Cannot Be Used"

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