Sorry for the incorrect name and I revised it 2 min after I typed it (too many nice juicy *FREE* noontime margaritas in Sin City). You wont lose your data, email etc. The computer experts who give great advice here easily can answer with the full info. Also do a search for it on microsoft.com/support or on your Win XP computer help menu.

Try this: start>programs>accessories>system tools>system restore