virus has been detected

hi guys
im german and my english is not so good but i will try it
when i start crossfire antivir says me that a virus has been detected
BDS/Turkohan.jhl its a Backdoorprogramm
i have no idea what it is or from what its coming i dont download any hack or something like that
C:\Programes\Z8Games\Crossfire\CShell.ddl
thats the infected data
please help me :D
and try to answer in german please

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