I don't know how I got back into this thread. I'm sure I was in a similar one, but didn't think I was here. Absolutely - no - don't do everything all over again. I thought I was somewhere else giving that advise. Thanks for reminding me of that movie, though.
It was a funny one - "Mars Attacks". They conquered Uranus before they got here, IIRC.
Sadly, I think you are right, as you edited into your original post...
"It doesn't look like this problem is going to get solved. It looks like the Windows installation has to be scrapped and a new clean install from scratch has to be done, followed by reinstalling all applications and repeating all settings of all applications
etc."
And remember what Greg said: "You're overdue for a Clean Install."
And I say remember to make a Windows system image backup afterwards to lock in the goodness. I think that's in Greg's post too. Make one immediately after the drivers are right in the clean install & that much works well. Then, you can always
return to it, if things go bad along the way of installing all your apps & recovering your files. Then make another backup when all is well with the installations.
Now I'm off to Pluto. I think the thread I was in is on there. Good luck, & keep us informed.
Edit: Some settings can be handled by syncing them before the clean install. Then afterwards they automatically will be retrieved when logging into the same Microsoft account...
https://www.bing.com/search?q=how+do+i+sync+my+settings+in+windows+10%3f&filters=guid:%224026102-en-dia%22%20lang:%22en%22&form=S00028
how do i sync my settings in windows 10?
That link is at "START, Settings, Accounts, Sync your settings".