msnsyst32win.exe is a Trojan.OptixP-M. msnsyst32win.exe opens a back door. Related files: %System%\msnsyst32win.exe %System%\qwinsyst32.exe %System%\g78zghwin.exe %System%\m87r8syst32.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill msnsyst32win.exe process and remove msnsyst32win.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.