Lien.exe is a mass-mailing worm W32.Mytob.CY@mm. Lien.exe tries to terminate antiviral programs installed on a user computer. Lien.exe opens a back door on TCP port 4512. Related files: %System%\Lien.exe Adds the value: "[http://]www.lienvandekelder[REMOVED].be" = "Lien.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill Lien.exe process and remove Lien.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.