Well, I've now taken the plunge and installed Win 10 on my H.P. Win 7 lappie.
The installation was uneventful, taking a few hours and the new OS does work - just. It takes ages to load and most of its utilities fail to work. This is because it needs to load all my old software titles before anything happens - and it gets slower and slower till, after an hour I give up. The much vaunted new version of internet explorer doesn't work either. Fortunately it let me keep my copy of Firefox which still gives me internet access. It seems to let me access my files on my other networked machines so I can still use my old Office software, but my Microsoft games (solitaire, spider, freecell and so on) have vanished and I cannot find any replacements.
I had few problems with Win 7 and even fewer with XP which I am still running on my main desktop machine. If the stories about Win 8 are anything to go by then I can understand why these users will find 10 better but. so far for me the upgrade was a complete waste of time and effort.
P.P.