Question: modern warfare iw3mp.exe has stopped working?
Answer: The first step would be to re-install the game. ... There is no need to uninstall the game, just overrun the setup so it can re-write files and repair the corrupt files. If this doesn't help, then use Revo Uninstaller to completely Uninstall the game, and using the Revo's Advanced Feature, uninstall left overs and traces.