Game performance question

So I just have a quick question. I installed everything on my system, did the crack and the ultimate fix. The game runs and loads but after about 20-30 minutes my computer just turns off and I have to hit the power button to start it again. Everything else runs fine, the computer over all runs fine...its just when I run the game. I have to be careful to save it every few minutes to make sure I don't lose anything important.

Any help?!

This should be in the gameplay section if this happens after properly installing. Oh well.
I would suggest this thread to try to eliminate possible causes.
Mods are causing mine to crash atm, but seeing as you just installed it I doubt that is the culprit, lol. Good luck! (:

I'd recommend trying game booster if you aren't already.

Also, are you on a laptop or desktop? And if a laptop, are you using a desk of some sort?