I should update to say that a simple repair did not work. I had to disconnect the drive and then repair. So I effectively repaired twice (which might have led to the other issue I am now facing). There might be other unknown considerations at play, but that's what worked for me.
Glad to hear the repair did work, I mentioned that you may need to remove any drives - which included the file history drive. I’ve found doing this gives the best install of a new version of Windows.
Sorry to hear it caused further problems though.
I see my fellow IA Greg is ansering you on your other question. I’ll take a look though.