Answered: computer won't recognize cortex

I have 12 cortex robots all are working prefectly except one. When I plug this cortex in to any computer (I only have XP sp3) the computers say “USB device not recognized… One of the USB devices connected to this computer has malfunctioned, and Windows does not recognize it.”
I have tried updating in RobotC and the vexnet firmware utility neither work because the cortex is not recognized. I can plug in another cortex, pic, or any controller to the same USB A-A cord and cortex, pic, or controller is recognized. Any suggestions???

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