trying to execute the upgrade file, my computer tells me it is currupt and won't finnish the upgrade
The upgrade file downloads but when I click to open and execute it it tells me it can't it is corrupt.
Opaite Mbohovái (1)
Delete the downloaded file, as it appears to be corrupt. Download a fresh copy of Firefox for installation.
Uninstall your current Firefox version before installing the new version but don't remove your profile data when you uninstall Firefox (do not select to remove personal data) or you will lose your bookmarks and other data in the profile folder. Remove the program folder for Firefox as well.
Do a clean reinstall as an administrator. See:
http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
For information on your profile folder, see Profile Manager - Create, remove or switch Firefox profiles and:
http://kb.mozillazine.org/Profile_folder_-_Firefox http://kb.mozillazine.org/Profile_backup
Please let us know how you fare.