Computer randomly crashes while playing games

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I have just bought a new computer with the following specs
3.00 Ghz Intel core 2 Duo
ATI Radeon HD3870X2
4gb DDR3 Ram
500gb Hard driver
Asus P5E3 Mobo
650W Power Supply
Windows Vista 64 bit

The while playing games such as Call of Duty 4 and World in Conflict I can play for about 5 mins to 30 mins then my computer would randomly shut off and restart.
The weird thing is that it plays fine in other games like Crysis on high graphisc and I can play for hours and have no problems.
The CPU tempearature is about 50-60C while playing and the GPU is about 70-80
Does anyone know what the problem may be?
Thanks
 
I have Catalyst 8.5 with the driver and I found out the other day that 8.6 was released. I got the latest display driver and it messed up my computer even more saying that there was no drivers installed at all :confused: and catalyst wouldnt open at all. So I just went back to 8.5 and it seems to work fine other than crashing
 
I have Catalyst 8.5 with the driver and I found out the other day that 8.6 was released. I got the latest display driver and it messed up my computer even more saying that there was no drivers installed at all :confused: and catalyst wouldnt open at all. So I just went back to 8.5 and it seems to work fine other than crashing
 
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