Go to System Properties - Advanced - Startup & Recovery Settings and UNcheck Automatically Restart. Next time you encounter an error you'll get a blue screen instead of a reboot. When that happens come back and tell us what that error is. My guess is it will be IRQ_NOT_LESS_THAN_OR_EQUAL_TO. If so, you'll need to get current drivers for all your hw. Get them from the OEM web sites, NOT Windows Update.