Kerne121.exe is a Trojan.Lineage-ON. Kerne121.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\Kerne121.exe %System%\microsoftie21.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill Kerne121.exe process and remove Kerne121.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.