Check in device manager if you see “Partner Window Controller” under “Universal Serial Bus devices” or “USB Serial Converter” under “Universal Serial Bus controllers”. If you see the USB Serial Converter, right-click on it and open the properties. Then go to “Driver” and select “Roll Back Driver”.

After that, you should see the driver name change to Tobii Dynavox and “Partner Window Controller” should reappear under “Universal Serial Bus devices”.