XP won't shut down

I have connected a Belkin powered 4 port USB hub to one of the two ports on my machine, the other connected to my Broadband modem. After some swapping of ports on the hub to get it to accept my card reader and scanner I now find XP won't shut down, but hangs on the "shutting down" message. If I unplug the USB hub XP shuts down as normal. Ideas?
Gov

  Fruit Bat /\0/\ 19:15 09 Aug 05

Shutdown problems
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