As before, thanks.

I've rebooted now - no probs. I'll look into your suggestion re imaging tomorrow.

Best wishes.

THANKS Dalchina, that seems to have worked. I now have a nice clean desktop with Settings, etc. working.

I don't need to reset the boot drive or anything do I?

And also - while getting Windows...

No, that's no problem - I upgraded well before the cutoff!

I've just found in System that Windows isn't activated. It was, and I can't do it from System - same flash-disappearing window.

This is a well-known problem and I've tried various solutions found Googling, without success, obviously.

1. The machine came with Win 8, which I upgraded to Win 10, without problems.
2. A few...