I have been through all of the Trouble Support information. My system meets the requirements, I have an ATI Radeon 5800 that also meets specs and supportability. I have opened all of the ports for both Blizzard downloader and Diablo3. I have an up-to-date WoW installation that uploads patches just fine. I've done several reboots.

The Updating Setup Files still hangs at the same spot every time.