Thanks to Windows 8.1 update going belly up, and of course removing all recovery points, I was forced to recover my system.
I did this from my Acronis True Image Nonstop Backup but after the recovery the system would not boot.
Hung in the boot process for more than 30 minutes before I turned it off.
This happened with both Partition and File Recovery methods.
Eventually had to go back to latest weekly backup which of course was 6 days old.
(Sods law strikes again! )

This is just the latest in a series of problems I've had with True Image, and since they they can't all be the fault of Windows 8, so I am seriously considering a different approach.

Perhaps I can get a refund from Acronis.

I am now running a full backup prior retrying the update to 8.1