I hate my computer!

So, I was playing Grid for 30 minutes, then my computer shut down. I played Grid for 3 hours sometimes, now I can only play 30 minutes? WTF? I tried it 4 times, but the computer always shuts down, this is crap. So I think I'll install Windows new, hopefully it'll work then, I mean it's a super PC, but this is shit. Have you had ´such a problem too? Leave comments to tell me.