After going through the process for an upgrade, we completely lost Mozilla. We get a message saying that we don't have permissions. How can I get the previous version back on my computer?

My husband received a message saying that there was an upgrade for FF Mozilla, so he proceeded to upgrade. After doing so he received a message saying we didn't have permissions. I took the laptop to the Geeks at Best Buy and was told that it was a software issue. We just want to get back to our previous version but can't do that either.

Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Do not remove personal data if you uninstall the current version.
* 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.
Your bookmarks and other profile data are stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox 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_backup

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