PCI card shows Code 10 after plugging in USB drive

A mate of mine just plugged his USB hard drive into my audio computer so he could burn some files off of it, and now both my Powercore (audio processing PCI card) and my 1394 Firewire card are showing up with exclamation marks and 'This device cannot start. (Code 10)'

I've tried reinstalling both drivers but nothing will work...getting a bit desperate.

If it helps, these items are in my USB controllers section of Device Manager...

-
Intel(R) 82801EB USB Universal Host Controller - 24D2
Intel(R) 82801EB USB Universal Host Controller - 24D4
Intel(R) 82801EB USB Universal Host Controller - 24D7
Intel(R) 82801EB USB Universal Host Controller - 24DE
Standard Enhanced PCI to USB Host Controller
Unknown Device
USB Composite Device
USB Composite Device
USB Root Hub
USB Root Hub
USB Root Hub
USB Root Hub
-

The Powercore card properties say...

-
Device type: POWERCORE family
Location: PCI Slot 2 (PCI bus 2, device 1, function 0)
Device status: This device cannot start. (Code 10)
Resource settings: This device isn't using any resources because it has a problem.
-

Any help much appreciated...

- Rob