I was playing Modern Warfare 2 earlier without any problems. I tried to get back on tonight & I can open it but after a couple of seconds I get a pop up saying "iw4mp.dat has stopped working" now I read the common issues fix thread, but I don't know when the last time it was edited or if someone found a fix for it already. I looked in my "m2demo" folder, there are no .iwd files located in that directory.

 

Any suggestions would be appreciated, thank you.

Delete your whole "m2demo" folder and "caches.xml"(Found in IW4M Directory) then LaunchIW4M..

Also exit any program running in the background eg-Anti-Virus programs etc.