It might be best to do a clean reinstall and delete the Firefox program folder in case some items are located in the Firefox program folder and those may be use to initialize a new profile.

Note that Windows hides some file extensions by default. Among them are .html and .ini and .js and .txt, so you may only see a name without file extension. You can see the real file type if you open the Properties via the right-click context menu

You can find the full version of the latest Firefox 22.0 release in all languages and for all Operating Systems here:

   http://www.mozilla.org/en-US/firefox/all.html 

Also create a new profile.

   https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles 

You can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

   http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Hello,

See this reply:

• questions/972419#answer-483776

You either need to remove the profiles.ini file that registers profile and link the profile name to a folder on the hard drive or use the Profile Manager to create a new profile.

• http://kb.mozillazine.org/profiles.ini_file
• http://kb.mozillazine.org/Profile_folder_-_Firefox

• http://kb.mozillazine.org/Recovering_a_missing_profile
• http://kb.mozillazine.org/Profile_Manager