Well for starters this,
Realtek RTL 8168 9 C (P) / 8111 (P) Family PCI-E GBE NIC
is your onboard ethernet, not the onboard sound. If you want to update the driver(s) do not get them through Windows Update, get them directly from Realtek. You can find the links to the latest audio driver here, Latest Realtek HD Audio Driver Version
and you can get the ethernet driver from Realtek as well.
P.S. If everything is working as it should you don't need to update the driver(s). If you don't wish to update then while in WU just right click on the offered driver and select "Hide Update" and you won't see it again.