The driver is either the standard Windows USB driver or the MTP driver in Windows Media Player 10 or above.
In Device Manager, Uninstall (not Disable) the Unknown Device.
Disconnect.
Reboot.
Connect the USB cord to the computer (not the unit yet).
With the unit off, push the power button down to Hold position, showing an orange dot. Open Windows Explorer (Computer or My Computer.) Hold down the << side of the wheel and keep holding it as you connect the cord.
It should pop up in Windows, be detected as a standard USB device and you’ll be back in business.
