I was using the computer when it froze. Problem seems to be "unmountable boot volume", which I think is computer talk for "can't start". I recently re-installed Windows 10 but with a working computer. I don't know if doing contributed or caused the corruption. I don't think so. It did well for several days after the re-install. The machine has quite a few years and lots of mileage on it but then so do I.
I have alternatives. I should be able to go a day or two with it in the shop. I will just remain calm and ring Carson to bring tea. This is a good time to try to catch up on the dozen or so books that I really want to get to. Maybe a good time to try out a Chromebook.