I downgraded to original radio 1.x and original software etc. The phone is stock, unrooted, s-ON, etc. I am running windows 7. I downloaded and ran the RUU update and it loads, runs, and the first thing it does is installs some new bootloader. Windows then decides it's time to reboot because of this new Bootloader. At the same time, a box comes on the screen saying Error  USB connection failure.
I tried a million things with no luck, so moved to the laptop. All went well until it began installing some bootloader, now I have the same ****ing problem. WTF? I decided to try my old phone, I still haven't returned. Same thing, and that phones stock too, except it's S-off.
I tried using XP compatibility mode, no luck. Seems like its computer related since it tried working when I switched to the laptop.