noctrn.dll is a Trojan.Clicker-AG. noctrn.dll opens a back door. Related files: C:\log.log %System%\MNeck.exe %System%\noctrn.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove noctrn.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.