Computer Freezes after, 2-5 mins of playing Call of Duty 2

Hello, I've just installed call of duty 2,
and after about 2-5mins of playing my computer Freezes,
what can I do? I've tried everything I could think of, I can run FarCry 3/Tomb Raider on full graphics. and I how I can't run an old game like that. Please help
Processor: Intel(TR)2 Quad CPU Q6600 @ 2.40GHz 2.40 GHz
GPU: NVIDIA GeForce GT 640
RAM: 2GB
Motherboard: Intel(R) 4 Series Chipset PCI Express Root Port - 2E31
 
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