Patch Virus?!

Hello i need very help!

i Dont know if this is a fail virus or anything else but it may be it is fail since it starts everytime.

My crossfire patched first for the halloween i think this is how it started and then came a backdoor virus up on the data CShellD idk what but i deleted it and crossfire didnt wanted to start so i cleaned all up scanned the whole computer installed again and then crossfire PATCHED again and the virus came back in the same data.

Without the data i cant start the game but with the data i got a virus please help i want to play CF :(