Cant play CoD4 Multiplayer! ( Singleplayer works fine )

Hello,i cant play CoD4 on multi player for some reason. when i start multiplayer, my screen goes black and then i get a message saying

"iw3mp.exe has stopped working"
Check for a solution Online
Close program

and thats it!
please help.
heres my specs:
o.s=win 7
2 gigs of ram
Intel core 2 duo 2.80 GHZ
ati radon hd 3450
3 answers Last reply
More about cant play cod4 multiplayer singleplayer works fine
  1. and your playing this using a legal copy of them game?
  2. I have read about a lot of people having that problem I think this is the best way just watch and learn
  3. true but you never know.
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