I have thus far:
1.) Reset the CMOS
2.) Flashed the BIOS
3.) Disabled USB in the BIOS / Re-enabled
4.) Removed the USB stack allowing XP (Media Center Edition) to redicover hardware
5.) Performed a clean installation of the OS.
6.) Updated all Motherboard drivers
7.) Checked all wiring and connections to mainboard
As you can see, I feel I've followed all the basics. Device Manager shows the USB Hub and there are no driver errors (exclamation points). The rest of the system appears to be functioning normally.