NLSrv.DLL is a Trojan.Feutel-BE. NLSrv.DLL opens a back door. Related files: %System%\NLSrv.exe %System%\NLSrv.DLL %System%\NLSrv_HOOk.DLL More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove NLSrv.DLL from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.