Fourdeltaone help required

So, when i try to launch it, it says this:
21978 files in iwd files


Error during initialization:
Couldn't load fileSysCheck.cfg. Make sure Modern Warfare 2 is run from the correct folder.


Also, normal mw2 says that too ( STEAM MW2 )

Hey Post it into correct section... Post it into Mw2 private servers instead of call of duty modern warfare 2 (Hacks)

Try to install it again, or run the aiwconfigture file , then it checks for updates and I read that you can dowload iw_00 again and replace it with the iw00 in main !