NotKelvir.exe is a worm W32.Kelvir-BD. NotKelvir.exe spreads via MSN Messenger. Related files: %System%\winproc.exe %System%\NotKelvir.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill NotKelvir.exe process and remove NotKelvir.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.