Crashes into a system reboot

[Jacarr]

I'll just be playing the game and it'll randomly crash into a blue screen and reboot my system on me. Sometimes I can play for three hours, an hour, 20 minutes. It really doesn't crash at any specific time, but the game plays great until then. Anyone know any quick pointers?

Downloaded it straight off the King's Bounty official site, using Vista 32, with a Radeon HD3870 x2. Only reason I'm listing those is because they're usually the culprit any time I have PC game issues otherwise I'll send the full dxdiag in to support.