msn32.exe is a mass-mailing worm W32.Mytob-FX. msn32.exe opens a back door on IRC channels. msn32.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\msn32.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill msn32.exe process and remove msn32.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.