If you have changed your video card since the game was installed do this.
Go to add/remove programs and do a repair install. Then go to start/programs/microsoft games/MW4 Vengence and select AutoConfigure. This will reset your graphics settings for the game. If this does'nt fix it please post your dxdiag report here.You may need to reinstall your sound card drivers. Go to my computer/properties. Click on the hardware tab and choose device manager. Scroll down to sound video and game controllers. Then go to the sound controller manufacturers website to check for updated drivers.
Go to add/remove programs and do a repair install. Then go to start/programs/microsoft games/MW4 Vengence and select AutoConfigure. This will reset your graphics settings for the game. If this does'nt fix it please post your dxdiag report here.You may need to reinstall your sound card drivers. Go to my computer/properties. Click on the hardware tab and choose device manager. Scroll down to sound video and game controllers. Then go to the sound controller manufacturers website to check for updated drivers.