If anyone else tries it, I'd point out that when the system says it needs to restart to update the Realtek Audio driver, there was a Command Prompt running some code at the same time. Wait for that to finish. It appears to have been updating more than just the audio driver. In the Command Prompt session, there were a series of pings to the local loopback IP so it must've been updating some Network drivers as well. Just wait a minute or two for that to finish, wouldn't want to interrupt ANY driver updates.