batman arkham asylum "dynamic link not located in stlport.5.1.dll"

when i tried to run batman arkham asylum it said that it was having some dll probs later i replaced the dlls but when i run it now it says [email protected][email protected][email protected]@[email protected]@[email protected]@[email protected]@[email protected]@QBEPBGXZ dynamic link not located in stlport.5.1.dll later i also opened the dll and added the link to it but then it says stlport.5.1.dll is not a valid image please check it against your windows installation diskette someone please help me thanks in advance.:upset: