My computer keeps rebooting after it reaches the desktop screen. It's an 2.2 amd quad, radeon hd3870 512mb card, gigabet mobo, os is xp, 2 gig ram. I just got the new hd 3870 yesterday because the old one fried and it worked fine all last night, until this morning. After turning the computer on it would reach the desktop and keep rebooting over and over and over, you get it. It works fine in safe mode. Should I try to reinstall the drivers, do a system restore, or just go ahead an reformat. I dont have anything important on the harddrive that I need at the moment. If anyone has any other trouble shooting techniques or questions please ask.