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Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

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Grand Master

Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

This happened

Every time Firefox opened

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

19 REPLIES
Shooting Star

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

Hello Ben.

Have you manually checked if that file exists?

This may be a problem with Windows, but not with Firefox.

If that file doesn't exist, though, you may need to reinstall Firefox (no data will be lost). You can get it (for free, as always) at http://getfirefox.com/

Grand Master

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

I found this post through google.

Since yesterday one of my clients machines (Windows XP SP3, FF 3.6.6) has been doing the same thing, the exe exists and the error even occurs if you manually run firefox.exe rather than a shortcut.

A re-install did nothing. It's as if something is stopping firefox.exe from executing, resulting in a not found error by the OS.

Grand Master

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

I have been having the exact same problem and it is becoming ridiculous; even clicking directly on the application within the Program Files folder will not open it.

Grand Master

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

I have had this problem since yesterday.

I tried scanning using my normal anti-virus software and no joy.

Downloaded and installed Malwarebytes and it found altered reg keys that were preventing firefox, chrome and safari running.

Once the scan was run and the threats removed firefox started no problem.

Hope this helps?

Site Moderator

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

Do a malware check with a few malware scan programs. You need to use all programs because each detects different malware. Make sure that you update each program to get the latest version of the database.

http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware http://www.superantispyware.com/ - SuperAntispyware http://www.safer-networking.org/en/index.html - Spybot Search & Destroy http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page .......... See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and What to do when searches take you to the wrong search website --- Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop. Uninstall your current Firefox version and remove the Firefox program folder before installing that 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.

You can skip the step to create a new profile, that is not necessary for this issue.

You can also try a custom install in a different directory.

Grand Master

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

I had the same problem but Malwarebytes' Anti-Malware couldnt find it.

Search the registry for zasrakomondohui - you should find a few apps which use something like the above as a debugger.

Remove those keys and should be ok

Grand Master

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

i have the exact same problem, and even if i manually try to open firefox (from the program files) i still get the same error message, i uninstalled it and reinstalled it and its still the same. please help!

Shooting Star

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

Grand Master

Re: Windows cannot find 'C:\Program files\Mozilla Firefox\Firefox.exe'

I had this problem until this morning, this is how I fixed it (using xp, don't know how different this is for newer OSs):

Start > Run > regedit.exe

Expand: My Computer > HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows NT > CurrentVersion > Image File Execution Options > firefox.exe

Then deleted the entry that resembled 'zasrakomondohui' as mentioned above. Hope that helps!