I just purchased my book essential backed up and then the plug got looses after that i keep getting the error wddm service not working and i cannot open the programme now at all.
Try uninstall the WD Smartware:
a. Launch the WD Smartware from the virtual CD
b. Go to the “Extras”
c. Launch the “WD SmartWare Uninstaller”
Please restart the computer before reinstall the WD SmartWare.
That should make the WDDM Service to work again.