i've recently plugged in a new graphics card (Nvidia 7950)

i started experiencing some problems when playing games,   the game would suddenly hang for about 30 seconds with the sound also crashing

after it starts up again the sound is cracking worse then a vasar....  which corrects itself after a few min

i only thoguht  it to be annoying to wait 30 seconds and have sound screwd up for 5/10 min,  

but just now playing a game with a friend of myn,  his entire pc hang becuase of my lag, and had 2 force-reboot his pc

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just noticed another hang when fighting in a gravity well and a starbase started construction

any thoughts on this would be greatly apreciated