The last bit of advice I can give you is to
A.) try a system restore, I know I know, it never works, its worth a shot though
B.) try this site
http://support.microsoft.com/default...;EN-US;q293907
Pay special attention to the repair feature! Also you might consider uninstalling 6.0 the program and then reinstall it...


Other than that I dunno what else to say other than to ask Conan on the best way to reinstall XP, as he seems to be the pro when it comes to that business.
BB