Cavey
GixXxer
robdevil
Gixx try to update all chipset, sound and video drivers, reinstall punk buster, reinstall game, try to direct connect by xfire, reinstall windows. buy new PC
LOL, i've done all that except buy new PC....
Gix have you reformatted your hhard drive, and built from scratch? If not I would recommend you do. As SOB said it is always a sound card driver issue. I would recommend installing all hardware drivers first, and COD 4 last.
I havent reformatted yet, but as you say i think im gonna have to. I will reformat and then update all drivers and then install the game and see what happens. The weird thing is my PC has been shutting down just browsing the interent, mainly when watching a video full screen, wouldnt even play facebook games. I'm hoping its a softwarte issue and not bad RAM or GPU... Thanks for the input, ill see what happens and get back to everyone...