Call of Duty 2 freezing

Hello people i got the freeze problems in call of duty 2

my rig is:

Core i5-650 3.2GHz

Radeon HD 5870 1024MB Crossfire

ram: 8gb ddr3

mother board : asus ph7

my problem is that if im in cod2 my cpu in core 1 goes to 100% and my complete pc freezes so that i must turn the power off of my pc and if im in black ops my complete cpu is like 10% and works like a charm
i got all the patches for call of duty 2 and a complete new windows 7 64 bit on my pc

so if any one got this problem plz help me with it
 
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