I made this thread a week or so ago because I was having exactly the same problem. I found this to fix the issue but it's only applicable if you're using Realtek audio. Thread is here.
Whatever the problem is I believe it's audio related. You could have a look over on the Call of Duty forums as I think there's a fix over there that developers have confirmed works also. Link to the COD4 forums is here.
had this prob after gettin new gfx card, for me it seemed to be cause by ati tray tools
which is 1st time ive used it since was nvida card before, so try disablin a few
programs ur runnin before runnin cod
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