I was playing quite happily when i chose to go onto a different server. When I connected it disconnected me and came up with this error "Imur client detected. Invalid .IWD files referenced. C:/Program Files/Steam/Steamapps/Call of Duty Modern Warfare 2/m2demo/iwm2_demo8_.IWD" Anyone know whether it's me or the server? It wasn't anything to do with DLC as it was on highrise. And I hvae the legit copy on steam otherwise the game wouldn't launch.

its the server

Yeah thanks, I managed to get on other servers.