Reply #7: That's exactly what happened to me

[blackcat77]

The restore points were still listed, and it would allow me to click them and start the process, but a minute or so later, it would put up a box saying it was unable to restore.

For me, the fatal blow came the next morning. I had the little bug on the taxkbar for an automatic update and since it had never caused me any problems, I just clicked it -- it was soon obvious that there were big problems. It kept saying couldn't install this and couldn't install that, an it took forever -- at least an hour. When it finally told me to reboot, it failed in the middle and I couldn't repair it.