20s will not connect to computer

I just bought a 2-pack of the 20s. One unit connect to the Windows 8 computer fine, the other generates and error message "USB Device not recognized. The last USB device you connected to this computer malfunctioned, and Windows will not recognize it. ...... If Windows still does not recognize it, your device may not be working properly."

What should I do?  No one is answering Sena Customer service in the US.


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