El:
Haven't had any experience with that particular board, but:
Are you showing any yellow exclamation marks for any of your USB controllers in Device Manager?
It's been my limited experience, that when you have 6 or so USB ports, it takes a combination of XP drivers which auto-sense one of the controllers, and installing the USB drivers from your motherboard CD, takes care of the other USB controller.
Then, there's the chance that I'm making things up again - lol!
Check that Device Manager first, for anything "awry."
- Bill