I know the problem. Re-installing your DX9 is not an option. CoD4 does not support with integrated graphics. I've tried it but with no luck. I then bought myself a 9600 GT and it works like a charm.
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CPU: Intel Core 2 Duo E6300 @1.86GHz
MOBO: Asus P5BW-LA
PSU: CoolerMaster Power Extreme 500W
VGA: eVGA 9600 GT 512mb GDDR3 @ 750/1870/1000
HDD: WD 250 GB SATA
RAM: 2 GB DDR2 PC2-5300
MONITOR: LG Flatron W2242TQ, NEC MultiSync LCD1530V
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