My apologies, that was somewhat vague! At the time I could not remember what the response was, only that it did not work, so I used an unhelpful catch all label. What had happened was that each time an error messaging saying something like the Restore procedure was damaged and could not work. No Restore action was launched.
Since then I have attempted Restore from my new local Admin account. This time the computer did carry out a (long) 'restoration' but alas it has not resolved the issue. because it took Windows back to a point after the signin failure. I was not surprised because the oldest of the R Points available was only just under thee days old, two older R Points had been automatically removed (I suspect as a result of new ones created by the two big Windows updates
during the last week?)
I have always been mystified by Windows removing the oldest RPs which seems to me to be the opposite of what it should be. It was explained to me once by a technician but I admit I did not understand the explanation. I dont see the point of removing older RPs which are surely the ones most likely to take the PC back to a working state.
Anyway, I am back to square one, trying to get to grips with using the local Admin account, something I have not done before.