"Cheapest" version of win7 should be perfectly sufficient for the purpose of just playing cod.
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specs -
OS - Win7 64 bit
CPU - Intel Core2duo x6800 OC@3.2ghz
MOBO - MB-EVGA122CKNF68BR
RAM - ddr2 6gb @800mhz
GPU - nVidia geforce GTX 280 1gb
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