My computer freezes when im playing games

Hey, my computer freezes and the screen goes black, and i have to manually restart it, its happening while im playing games like, TF2, Dead Rising 2, Gta Iv and League of legends when i run it on max graphic, but it doesnt happen when i play Cod on max graphic, so i cant understand whats the problem is, and it started to happen around 2 weeks ago, and had no problem with it before that.
I have also reformated my computer and it still happens?

Operating System - Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.100618-1621)
System Manufacturer - Acer
System Model - Aspire M5800/M3800
Processor - Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz (4 CPUs),~2.5GHz
Memory - 6144MB RAM
Available OS Memory - 6144MB RAM
DirectX Version - DirectX 11
 
Your video card is probably overheating. Try lowering the settings on all those games down to minimum and see if the problem persists.
 
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