Modern Warfare 2 crashes after I try to play 2nd round

[advancedlamb]

It plays just fine the first time around, but then if I go to another lobby and join a game, it crashes mid loading, or it just lags like fuck. and THEN it crashes next game.

Yes yes, I expect dumbs for talking about MW2, but I'd appreciate help.

[editline]03:56PM[/editline]

Error says that "iw4mp.exe has stopped working"

[Thegreen]

First verify the game files, then update your video drivers.