I have m470n media center PC. I have installed XP professional as media center operating system ( XP home + media center drivers ) got corrupted. I had to dis-able on board network card (RealTek) as the system was getting frozen otherwise. I latter installed a Realtek network card in the available PCI slot. But, the system is not recognizing it. Can anybody help me how to enable the network card installed in the PCI slot.