Computer is freezing


Jul 13, 2009
Hi, I have just updated my PC. The configurations are as follows:

*Intel Core 2 Quad 9400

*Motherboard XFX 750i SLI

*RAM DDR2 Transcend 2 GB

*Sapphire Radeon 4890 1 GB.

*PSU- Tharmaltake 750 W

But the problem is My PC gets freeze at the middle of operation. It is constantly happening in the middle of playing game. I am trying to play call of duty 5, but within 10 minutes it gets frozen. My PC Case does not contain any single cooler fan except fans on graphics card, processor and PSU. Is it over heating problem? Should I change my PC Case? How can I rectify this problem? Thank you