This seems pretty unfortunate, maddock34!
Which Windows OS version are you using?
You should keep in mind that the WD Backup utility is supported by Windows Vista, Windows 7 and Windows 8/8.1 for now.
I think that if you reinstall the software it might help. You can find it in the
WD Downloads on our official website.
Give it a try and let me know how it goes after the reinstall. Good luck!
SuperSoph_WD