greendaysk8r : as you are using windows XP, have you tried installing Plus! on the administrator account? To be sure you have the account with all priviledges boot into safemode and choose the account called "administrator". After installing plus! onthere go back to your regular account and see if the problem is solved, if not reinstall plus! there aswell. If nothing else works you can force plus! to load on startup as described earlier on in this thread or place plus! in your startupfolder.
Edit: yw