Whenever I click multiplayer on CoD4 on pc, it closes the game saying iw3mp.exe has stopped working, I looked it up online, saying something about updating your drivers, which I did, and it said to reinstall the game, which I did, I start it up, click multiplayer, nothing.

It was working fine yesterday, and the many days before, but why suddenly has it broken?

I dont play on PC so I couldnt tell you, but check this out for some possible answers.

iw3mp.exe Error

Have you tried loading single player? Just out of curiosity? I don't understand why it should happen other than not updating drivers... Sorry if I not helped.

I'm not one for PC gaming myself but have you run disk error checking? Maybe that will help if you have an error on your machine??

Theres a sticky under News and announcements for this topic. Check it out.