msnzx.exe is a Trojan W32.Sdbot-ACW. msnzx.exe opens a back door on IRC channels. msnzx.exe spreads via open network shares. msnzx.exe tries to terminate antiviral programs installed on a user computer. Related files: %Windows%\msnzx.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill msnzx.exe process and remove msnzx.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.