Msnnm.exe is a Trojan PWSteal.Revcuss.C. Msnnm.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\msnnm.exe %Windir%\msndr.exe Adds the value: "WinUpdate Loader" = "%System%\msnnm.exe" "run" = "%Windir%\msndr.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill msnnm.exe process and remove msnnm.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.