That Windows XP loading bar is it booting up. That's quite interesting that it loads and freezes when you boot or restart, but you can get it to properly boot by power-cycling it. What do you mean by you added a USB 2.0? You added a hub to the motherboard? Or did you plug a USB device in? If so, I'd suggest unplugging the device, looking up and installing drivers, and then plugging it in. If you mean a USB hub... I'm not sure what it would mean. Perhaps Windows doesn't like the fact that it suddenly has several more USB ports where there weren't any before... Reinstalling Windows would probably solve your problem, but let's not get too drastic here.
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