Can't launch firefox or the profile manager. Get an error that the profile is missing. Any ideas?

I have numerous users that are having this same issue. I cannot launch firefox or the profile manager. I have tried removing firefox and installing it again but get the same error. Any help would be greatly appreciated.

See:
*http://kb.mozillazine.org/Recovering_a_missing_profile
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/sessionstore.js
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(When I launch Firefox 4.0.1 I get an error message that says "We noticed your may have signed inor signed out in another window. Click Ok to reload your page." Richard)

<blockquote>Locking duplicate thread. 
Please continue here: [/questions/830592]</blockquote> 
(When I launch Firefox 4.0.1 I get an error message that says "We noticed your may have signed inor signed out in another window. Click Ok to reload your page." I deleted Firefox and reloaded it - did not solve the problem. This started occurring after I downloaded Windows Service Pack 2. I have Vista 7 OS. So every time I close and relaunch Firefox, I have to sign in with my username and password. Very very, annoying. If I can't get this corrected, I have to start using another Browser. Thanks for your help. Richard)

It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
Delete the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/sessionstore.js
If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well. 
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* http://kb.mozillazine.org/Session_Restore

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https://support.mozilla.com/en-US/questions/823873
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Can't launch firefox or the profile manager. Get an error that the profile is missing. Any ideas?

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