Hello Pete,
Thank you for keeping us updated on the status of the issue and apology for the delayed response.
I understand the inconvenience that you have to go through due to this issue.
I would suggest you to create a Windows 8 bootable USB drive and the try the above steps provided by me.
**Note:**When you use System Restore to restore the computer to a previous state, programs and updates that you installed are removed.
Please reply with the results, in order to help you fix the issue.
Thank you