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Tried latest patch?
what is the reason it gives for the iw3mp.exe crashing?
Not sure - it's something to do with Vista and COD4 and how the onboard sound drivers are used.
This is the wrong section mate, Pc games is where it should be
i got this recently for no apparent reason as i hadn't changed anything and it had worked fine since launch. just got a new soundcard and installed new drivers of course and it seems to have gone away thankfully
I had this error too ..... most frustrating.
I resolved it by finding out my issue was caused by me filtering servers in a zombie mod that I had been playing. Every time I wanted to look for regular servers the game would crash with this error.
I rectified this issue by loading up the mod and removing the filters I had applied whilst playing the mod.
Hope this sorts your issue,