I've reinnstalled XP 2 times - with same result. The last time I formatted as well. All drivers - BIOS, Via 4 in 1, nvidia drivers, xp updates.. everyting updated. I had altmost the same problem in Win2k Checked all hardware except CPU & motherboard - don't have any to switch with.. The crashes always occur while CPU is idle.. It's stable if running a burning test or anything else that use 100% CPU.. strange? Not clocked good temps.. Since I've checked all hardware it's no use in making a list of spesifications since I know it's not what's wrong.. MB MSI K7T266 PRO-RU CPU Athlon tbird 1200Mhz can it have something to do with idle state and settings in BIOS which don't change when reset or updated? I get bluescreens flashing for a sec before the PC is restarting.. driving me mad !