msmnart32.exe is a Trojan W32.Rbot-CJV. msmnart32.exe opens a back door. msmnart32.exe deletes files off the computer. msmnart32.exe tries to terminate antiviral programs installed on a user computer. msmnart32.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\msmnart32.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill msmnart32.exe process and remove msmnart32.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.