I wonder why you can't access the internet...are you using the driver from Realtek's website? Better by far than trying to wrestle with the Gigabyte driver.
As for solving the USB problem, you don't need internet access--the drivers are already on your machine. The trouble is the default W2k Pro selections, which are wrong and must be overridden using Microsoft Windows Update in Device Manager (not online).
After all the years and all the times this has come up, I'd like to go through one example of the installation procedure, which varies based on motherboard, mouse, the particular OS package and God only knows what else, but this site's not letting me post the pics (there are 18 of them). If I can load them a few (or even one) at a time, I will do so.