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