Hi All,
I got fed up with trying umpteen possible solutions (thanks for all your advice) but unfortunately none worked.

So I took the plunge and did a complete re-install of my PC from Windows 10 up !
It took me nearly TWO DAYS, but everything works as it should.
The unfortunate thing is that I still don't know what caused it in the first place.

But all up and running now and thanks again for your help.

Al


BIAB 2017 Everything, RB 2017
Lenovo All-in-One. i5, 8gb Ram, 1 TB SHDD, Windows 10
Presonus AudioBox,Studio One 3, Behringer Xenyx302,
M-Audio Axiom 61, Samson Graphite 49.
Lenove Flex 15, i3,Windows 10