I just built a new PC and it won't connect to the internet to install new drivers. It has Windows 8.1 64-bit installed via external dvd driver and the MoBo is the AsRock Z87 Killer. I've tried to install updated drivers with a usb but for windows to update I need to have an internet connection. I have it connected wired but there is no network to be found.
Try to download this in another PC with internet connection. Put on a Flash Drive and install to your PC.
Windows Update requires Internet Connection, so much better that you install the drivers for the LAN or WLAN first. Check your Other Devices category in the Device Manager, you will see there how many devices are needed to be updated.