Game keeps randomly crashing and forcing my computer to restart

[noodlecake]

My game keeps crashing and forcing my desktop pc to restart. I'm running Windows 7 and I have a Radeon HD 6950. I don't have this problem with any other games or anything. It's annoying because I REALLY want to play this but I usually can't play for more than about 15 minutes before it freezes and forces a restart.

[Anarchist Rabbit]

when i try to start it, there comes just the message : HMH doesnt respond :/