Frontline: Fuel of War shuts down my PC!!!!

ok which quad core? intel or amd, stock cooling or aftermarket and what case do you have, it is a major part of heat, my case has a bad airflow (and it really hard to put things in and out in but it looks cool) but i have a fan blowing right into the side. So just a thought, also download rivatuner. open it up click the first arrow and click the memory chip hit the record button (big red button down the bottom) play what crashes you for about 3 minutes (just to be on the safe side) close hit the save button and post the log ill see what i can come up with