Hi again,
I created the structure as described, see attached image.
Once done I rebooted then ran the standalone installer for the update. It took almost 2 hours to run through, and considering I have an i7, 8GB RAM and the O/S is on an SSD, I was surprised it took that long. Still, had no errors and when complete rebooted. Unfortunately it got to 8% again and failed, saying it had to revert changes.
I tried from windows update too and that also took forever and failed in the same way.
Update KB3048778 is also queued to update now (optional update) but I've not done it yet as I don't want to change anything.
Any help much appreciated, I'll post anymore logs you need
Cheers