I replied to Art's lengthy article (see below) which included several suggestions. Note: I have performed Google searches for the most recent suggestions to see if anything worked! I have also gone through this Microsoft community blog which is now very
lengthy with almost unmanageable threads.
I would seem that to date, the only real solutions are as follows:
(1) New ID (tried this and not a "happy", also some say it is a temporary fix)
(2) Restore or reinstall W10
NOTE: After trying all suggestions, I now have two IDs. I can hobble along with my former ID ... BUT, no Cortana and no "?" help button!
Art:
Thank you for the suggestions.
I have tried all except the last two ... disabling, uninstalling anti-virus, and reinstalling. I have my doubts that Norton is the problem!
Obviously restoring W10 is a lot of work and something I chose to avoid since a lot of software would have to be reinstalled.