NLSrv.exe is a Trojan.Feutel-BE. NLSrv.exe 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: Kill NLSrv.exe process and remove NLSrv.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.