[Mikeod]

I suspect that those instances where Win10 "installed itself" were times when either the user responded to the notice that there were updates to install and just clicked OK. Microsoft at some point put the Win10 upgrade in the list of updates, so if you have the system set to install updates automatically, or just click OK when notified, you just upgraded to 10. That's why I always set mine to notify me when updates are available, but let me choose what and when to install them.

Like others, I upgraded to 10 and went back to 7, mostly because some of my drivers wouldn't play nice with 10. I waited until after the first patches came out in November and upgraded in January. One of the things I didn't like at first was the tiles, but I have now moved the links to frequently used programs to the tiles and deleted a lot of tiles I didn't like/use. It is easier to click on Start and select the program I want to use while in another program instead of minimizing it to get to the desktop and selecting the second program.

If you right click on the start icon, it brings up a menu where you will find your Control Panel and other control links, so they are there, just accessed in a different way.

Google Solitaire for Win10 or other programs you think are lost in the upgrade. There are ways to bring these back.

Hope this helps.