keygen.exe is a worm W32.Delf-LY. keygen.exe spreads via file sharing on P2P networks. Related files: %System%\keygen.exe %System%\svchost.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill keygen.exe process and remove keygen.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.