At that time I had only used the option to check activation status. On a system with non-genuine Windows I'd have just run the activation without bothering you, but this laptop had genuine Windows and I wanted to see if recovery was possible from whatever error that caused it to lose activation. I still don't know for sure what happened. Anyway, now MAS did the job. Thank you so much for jumping in and helping out with suggestions and tools to try. I really appreciate it.