No zkoušel jsem to na PC s delphi, kde je Realtek jako jedina sitovka a funguje.
V notasu je Intel(R) PRO/1000 PL Network Connection.
A je v pořadí až druha v seznamu.

begin;
    FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
    FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
    FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM Win32_NetworkAdapter where name= "Intel(R) PRO/1000 PL Network Connection"','WQL',wbemFlagForwardOnly);
    oEnum := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
    oEnum.Next(1, FWbemObject, iValue);
    FWbemObject.Disable();
    FWbemObject:=Unassigned;
end;

Visi mi to na FWbemObject.Disable()
First chance exception at $7C812AEB. Exception class EOleError with message 'Method 'Disable' not supported by