First time I've managed to install and run it properly. Second time I run it I get this error. I deleted all 4d1 files, reintalled 5 times, same error. What the hell do I do?

Move the game files to another folder and reinstall IW4M after you moved it.

Hello,

 

put the mss32.dll from viewtopic.php?f=7&t=4144 , #24 in the IW4 folder, should work.

Thanks for the help anyway I fixed it by copying original mw2 files from steamapps.