Hi, Sorry to hear have a issue. It may seem to be that a file has been clipped/corrupted during reboot process of your install. Like to suggest try this 1st please as it fixes Microsoft Registry Errors and System Files. http://www.thewindowsclub.com/how-to-run-system-file-checker-analyze-its-logs-in-windows-7-vista Note in may take awhile to run. Reboot after.

Please make a copy of your bookmarks and email to self or store it safely :

• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

If SFC does not fix the issue Please : Create a new profile as a TEST to check if your current profile is causing the problem.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem. Never work with original files.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Please let us know if this solved your issue or if need further assistance.

jrogelio said

After i installed windows 7 service pack and plataform updater i start to get multiple messages about the error of missing profile or can be access it, the amount of messages that appear even if im not using firefox is like 5 every 2 minutes; Even i tried uninstalling and reinstalling firefox

If Firefox is your default browser, you may be getting those messages because other applications are trying to open links. If you temporarily make Internet Explorer your default browser, then you can get a better idea of what is trying to open in a browser. Hopefully they are legitimate links and not requested by malware.

In addition to the above help articles, there's this one: How to run Firefox when your profile is missing or inaccessible.