I recently re-formatted the hard drive and re-installed windows and for some reason now the computer just restarts after about 20 minutes of use. It doesn't matter wether it is idle or in use, it just restarts. The heck of it is, there are no errors being reported, and after it restarts windows starts up fine. I did a search for other post but they all have some kind of error involved. I have ran memtest for 3 hours and no errors. I am clueless. Windows XP Pro Corporate (SP2 Integrated) Athlon XP 3200+ ASUS A7N8X-E Deluxe ATI 9600 XT Omni PC3200 (1.5GB) PLEASE SOMEONE HELP ME.