Alright I found the problem. Seems my MSI 6950 2gb video card was not cooling effectively with the auto fan. Had to manual set the fan at 60. Which kept the card at 65 C max settings for crysis 2. On auto the card slowly but surely reached 90 C which made the computer shutdown.
However, I read online that 90 C on a 6950 is normal under full load. Should I contact MSI and ask for a RMA? Kinda of annoying that I have to manually set the fan speed everytime am going to game. Temporary fix I guess. Fan is considerably loud at 60%