msnsupdate.exe is a Trojan W32.Rbot-AXS. msnsupdate.exe opens a back door on IRC channels. msnsupdate.exe spreads via open network shares. Related files: %System%\msnsupdate.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill msnsupdate.exe process and remove msnsupdate.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.