Glad the NIC drivers worked. I know that with audio, you need to install something else first... But for the life of me I cannot think what.
Hhhhhmmm... It's a system update, that part I know... Have you loaded the system drivers from your motherboard CD? DAMMIT!!! There is a driver you need to load before Realtek drivers work!
It might be the USB2 drivers...
Don't you have a SoundMAX chipset? That's what the site says....