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