ntsysv.exe is a Trojan.Mifeng-E. ntsysv.exe modifies data on the computer. Related files: %System%\ntsysv.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill ntsysv.exe process and remove ntsysv.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.