mswsck2.dll is a Trojan.Cimuz-O. mswsck2.dll opens a back door. mswsck2.dll tries to terminate antiviral programs installed on a user computer. Related files: %System%\mdms.exe %System%\sporder.dll %System%\mswsck2.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove mswsck2.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.