Fixed at last!
It was some thing to do with a Windows Critical (!) update. Which one I dont know, so in future it will be download 1 at a time and check for problems.
Now Retired Ex-professional photographer. I re-trained as a Desktop Support manager with a user group of 4000+, until we were shutdown and outsourced (common story) Sitting at home enjoying(?) life. Back to first love, Photograpy, but all digital now!