“HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParametersDNSRegisteredAdapters”

 then that adapter will register in DNS unless you put a registry

      “DisableDynamicUpdate” in  “TcpipParametersInterfaceGUID” key of

      that adapter.

      2)      “Register this connection’s address in DNS” in the adapter

      TCP/IP properties corresponds to the registry key

      “TcpipParametersInterfaceGUIDRegistrationEnabled”.

      3)      So, if you uncheck the check box for registration in DNS on

      the NIC it will set “RegistrationEnabled” =0 however for some reason

      if that GUID is not removed from

      “TcpipParametersDNSRegisteredAdapters” then that adapter will

      continue to register in DNS.