hi guys, i am using xp pro on an asrock k7vt6 motherboard using an amd 3200 cpu 512 mb ddr memory. the system keep rebooting when i randomly at times when i click to do something, like just6 now it shut down when i started ms paint up. before it shut down when i clicked to open a new internet explorer wondow. i have not added any hardware recently, i have scanned for virus with avg and housecall but no virus found. i have switched hard drives over, reformatted hard drives and reinstalled windows xp pro on blank hard drive and still it happens. where do i go from here? is it a hardware issue? its driving me nuts, it can be fine for an hour or two then it just reboots itself. the cpu is not over heating either i checked that. i dont know what to do next really, any thoughts???