Hello Diddlyidi,
Just to clarify. Do you have all your Windows Updates installed? Specifically, the required KB2871389 and KB2917499 updates.
http://www.eightforums.com/tutorials/25343-windows-update-check-install-windows-8-a.html
Windows Update - View Update History Details - Windows 7 Help Forums
See if OPTION ONE in the tutorial below may be able to help. Be sure to read all the notes and such in it to further help.
http://www.eightforums.com/tutorials/32995-windows-8-1-update-windows-8-a.html
Hope this helps for now,
Shawn