do you ever use a hack ? for crossfire because if you have used a hack maybe thats why it says you Client file corruption detected,Closing game client | try to play without hack
can you put an URL of a picture that you have the ERROR ?!?!
(i mean a screenshot)
Uninstall ANYthing do to CF, Metin2, or Z8Games
Try disabling Avast and not using the other programs before you run CF.
Try reinstall CF, and check for errors on your PC and reg files using CCleaner.