You might have the wrong driver installed for the usb hub in the computer. Is there a failure mentioned under hardware manager-device-driver or resources?
You may succeed by removing everything usb from device manager, restart the computer, and let it reinstall. If this doesn't help, and hardware manager says driver issues, update the driver through there and choose some standard one, or maybe use the cd that came with the motherboard to load a driver off that, by clicking "have disk" and browse to the cd driver folder or something similar.
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This sort of thing has cropped up before....and it has always been due to human error.
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