Try visiting a chatroom (WinMxWorld.com_E3D7EFD50D3D << very good choice) where you can try with someone who has a known good setup & known good files, to test the function, unless these are new downloads since upgrading to 3.0 patch the likeliest cause would be fake (flooded) files, the good news is, if so the fix is as simple as upgrading to the 3.0 patch & removing your incompletes.