Well, I must correct myself a bit. Although I left my lappie in standby overnight Win 10 appears to have still been working to sort itself out. Most of its facilities appear to be working now and I am trying them out. Yesterday, Firefox was always whinging that it was not my default browser. When I clicked on "make it default" the whole system locked up as the facility associating software with certain functions refused to function. When I tried this again today it all worked nicely. I am now a happier bunny!
P.P.