[REQ] A bit of CoD4 help

Well, it's simple: I get this error when running CoD4 multiplayer:

Problem signature:
Problem Event Name: APPCRASH
Application Name: iw3mp.exe
Application Version: 0.0.0.0
Application Timestamp: 4797d45e
Fault Module Name: iw3mp.exe
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4797d45e
Exception Code: c0000005
Exception Offset: 0017b380
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1060
Additional Information 1: 8d13
Additional Information 2: cdca9b1d21d12b77d84f02df48e34311
Additional Information 3: 8d13
Additional Information 4: cdca9b1d21d12b77d84f02df48e34311

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I just got a legit Vista and installed CoD4 and ... bam! Error
I searched the web, did everything, no results. I went to some CoD4 forums, they told me to gtfo cuz I was a 'mod leacher' . So I have to settle with the *professional* opinion of MPGH members.

Sounds stupid but i fixed this problem with mine but i forgot... but its something to do with the speakers try going into sound on control panel and going to recording and you need stereo mix enabled and that should hopefully make it work if not ill try and see what else i did