Message "Windows security has found critical process activity on your system and will perform fast scan of system files" gray screen, is frozen uninstall and reinstall same, also this is on the bottom left "Read melhores-antivirus.ce.ms"

help me

Sounds like an infection on the machine, not a FF issue. Run a virus scan by going to your anti-virus program yourself. NEVER click on any pop-ups that warn you of a virus even the red "x" to close it. Viruses can spoof the look and feel of legitimate dialogs and can even activate if clicking the "x" instead of closing. Simply ignore them, then run a scan manually.
Also, I've seen some recent redirects that send you to a spoof site that looks like WinXP "My Computer" page and shows that you have "viruses" with a click to scan or clean option. But this isn't My Computer, it's just a web page designed to infect you. Just close that page or tab.

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I just had an update of Firefox, and next thing I knew, I had a message from "Mozilla Security" telling me it had found "critical process activity on my system and will perform fast scan of system files.

This is the message in the dialog box that showed up:
Firefox security alert
Scanning of your system is currently on, please wait until the end. Your system affected by numerous virus attacks, Mozilla Firefox recommends you to install proper software to protect your computer
Quick scan system:
Scan complete
Number of scanned objects: 3676
Number of infected objects: 97
It then directs me to Click "Start Protection" button to erase all threats. If I do that, an install program window pops up with: installInternetDefender_143.exe
from http://monozsa.ce.ms
I don't automatically click on those unless I know they are legitimate. I'm just concerned that the security issue came about after I received an update to my Firefox.
I already have a security program installed on my computer through my internet provider--why would it not have picked up these infected objects? Is this legitimate? It

The scanning is most likely an animation and not a real scan. 
As long as you didn't download and install that program then you should be safe.
To be sure you can do a malware check with some malware scanning programs. 
You need to scan with all programs because each program detects different malware. 
Make sure that you update each program to get the latest version of their databases before doing a scan. 
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also:
* "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

I getthe message Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. It is NOT open I onlly have one computer

I installed FF on my new computer, Windows 7 Toshiba, I get the message''' Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system'''. It is NOT open I only have one computer.
I had a computer expert try everything and we cannot get it to open.

Look for the firefox process firefox.exe and kill it with for instance task manager. it is also worth watching for plugincontainer.exe.
The problem and solutions are explained in the articles:
* [[firefox is already running but is not responding]]
*[[firefox hangs]]

I get this message box when I click on a link (in a document or email)"firefox is already running, but not reponding. To open a new window, you must first close the existing firefox process, or restart your system"

if Firefox is already running and click on any link in Word, Excel, Outlook, etc. A message box pops up and I have to hit OK to close it.
"firefox is already running, but not reponding. To open a new window, you must first close the existing firefox process, or restart your system"

if Firefox is already running and click on any link in Word, Excel, Outlook, etc. A message box pops up and I have to hit OK to close it.
"firefox is already running, but not reponding. To open a new window, you must first close the existing firefox process, or restart your system"

When i exit firefox &try to reopen the message is showing as Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.why this happens even i close it by exit.

after i exit firefox & tried to open,it is not opening,instead this message is coming as 'Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.'kindly help me.everytime to open i have to go to task manager & stop the process.

[https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_firefox-hangs-when-you-quit-it Firefox hangs when you close it]

Sometimes when I close Firefox and try to open it in few moments it shows me message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." However, I haven't o

Sometimes when I close Firefox and try to open it in few moments it shows me message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." However, I haven't opened any additional Firefox related programs, and previous Firefox is closed. First I though it is because of my computer, but then I discovered that other people have the same problem as well
== This happened ==
A few times a week
== some 2 month ago ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; InfoPath.2; .NET CLR 3.0.30729)

Hi Andis.
First of all, this is completely normal behavior, although it's a bit irritating, I know. What happens is that when you close Firefox, despite the window disappearing right there and then, Firefox keeps running for a little bit until the whole closing procedure is completed. This can take a fraction of a second on fast computers, or can take a few seconds on slow computers or when Firefox is storing a large session (if you save your tabs). All you have to do is wait a bit until Firefox closes, and then open it again.
To see if it's still running, you can press CTRL+SHIFT+ESC and then, under the Processes tab, you can see if firefox.exe is still there. If it's taking an unusual amount of time to close (which happens very rarely, and only if the browser freezes on exit), you can force the application to terminate from this application (task manager).
Firefox 4.0 will reduce by 97% the time it takes firefox.exe to close, so this problem will be basically erased for Firefox's next version.
Until then, I can recommend you this extension, which helps you restart your browser more easily and without bothering about closing times:
https://addons.mozilla.org/en-US/firefox/addon/3559/
Hopefully this will help.

Why does firefox stop loading then when i close it and try to open it up again I keep getting this message:Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system

Firefox will just stop loading/ connecting to the internet. The gray circle will just continually move but it never turns green to load the pages. I know it's not my internet because my internet explorer works just fine while this is happening to firefox. So I close firefox and then try to re open it but I get the message: Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. So I wait a little bit then try and re open it and still get the same message. I then go into my windows task manager and try and end the firefox proccess but it won't end. So I restart my computer and firefox eventually starts acting up again.

For possible causes of this error, and how to troubleshoot it see [[Firefox is already running but is not responding]].

Since the latest Firefox update, the Personas icon (brown fox) that appeared in the bottom left corner, has disappeared. Where did it go and how do I get it back?

I have a Personas account. The brown fox icon was present in the bottom left corner of my screen before the latest version of Firefox downloaded, but is not there anymore. I have to go to the Personas web site now whenever I want to manage my Persona. Previously, all I had to do was click on the brown fox, and do what I wanted to do from there.
Why has this changed, and how to I put it back to the way it was before?

Try this:
http://www.downloadhelper.net/manual.php
You may need to manually add the icon to your toolbar.

I always get the message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." on terying to run firefox

When I try to run Firefox I get the message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."
No copy of firefox is running as far as I can tell. Restart and restoring system to 10 days ago did not help.
Uninstalling and downloading a new copy - but to not avail.

See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use
Do you still have a default profile? 
If not then delete the file [http://kb.mozillazine.org/profiles.ini_file profiles.ini] to make Firefox create a new default profile.
* C:\Documents and Settings\<user>\Application Data\Mozilla\Firefox\Profiles\<profile>\

Keep getting this message"Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." , but cannot view Firefox open window or close it. Have to always reboot system.

Keep getting this message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." However, cannot view open window or close Firefox. Have to always reboot system to access the internet.

For possible causes of this error, and how to troubleshoot it see [[Firefox is already running but is not responding]].

Hi when I try to open my itunes a message appears 'application has failed to start becasue MSVCR80.dll has not been found. If I delete I Tunes and reinstall will all my music have to be reinstalled too?

Question, When I try to open my itunes a message appears 'application has failed to start becasue MSVCR80.dll has not been found. If I delete I Tunes and reinstall will all my music have to be reinstalled too?

Your media should be safe, though you should backup routinely anyway.
See Troubleshooting issues with iTunes for Windows updates.
tt2

I try to launch firefox get the following message "firefox is already running, but is not resonding. to open a new window, you must first close the existing firefox process, or restart your system" firefox is not running and restart doesn't work

when I launch firefox get the following message "firefox is already running, but is not resonding. to open a new window, you must first close the existing firefox process, or restart your system" firefox not running and a restart doesn't solve the problem

Download a fresh Firefox copy and save the file to the desktop.
*Firefox 12.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
See also:
*https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
*http://kb.mozillazine.org/Profile_in_use
*http://kb.mozillazine.org/Recovering_a_missing_profile

I keep getting this message after closing Firefox and attempt to reopen-Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

I keep getting this message after closing Firefox and attempt to reopen-Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use

I get a message that says ff is already running but is not responding ,to open a new window, you must close the existing ff process or restart your system, how do i close the existing ff process?

I have windows 7 on dell laptop. I am working on a Word Document and want to go to a diff window for some information. I click on the FF icon on my desktop and get a message that says...FF is already running but is not responding. To open a new window, you must close the existing ff process or restart your system..how do you close the existing ff process?
== This happened ==
Every time Firefox opened
== I got my new dell laptop four weeks ago with window 7 installed

See https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding

My link preview has disappeared from the bottom left of the page (it no longer pops up when I hover over a link.) Thoughts on how to get it back? I really LIKE having it!

My link preview has disappeared from the bottom left of the page (it no longer pops up when I hover over a link.) Thoughts on how to get it back? I really LIKE having it!

It is possible that the screen is too high and that the scroll bar and the find bar and add-on bar fall off at the bottom.
If that works then close Firefox (File > Exit/Quit) to save that setting.
See also:
* http://kb.mozillazine.org/Resizing_oversize_window
If the above didn't help then see:
* http://kb.mozillazine.org/Corrupt_localstore.rdf

Message "Windows security has found critical process activity on your system and will perform fast scan of system files" gray screen, is frozen uninstall and reinstall same, also this is on the bottom left "Read melhores-antivirus.ce.ms"

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