However the next morning I found that the start button, and all other buttons that would be used to access actual Windows 10 features did not work. Fortunately my normal desktop was on, and all my programs (minus 1) worked fine. While Microsoft's new Edge browser did not work, my Google Chrome worked fine.
I "Googled" the errors and found that I was not alone - not by a long shot. I tried the suggested fixes, but they did not restore the functions that they were supposed to fix. One exception was the fix suggested for my one program that did not work, Microsoft Money Sunset edition. I use that to keep track of all my income and expenses, so it's pretty important to me. The suggest fix was a minor change in the registry, which I was able to access and fix, and Money ran fine after that-whew!
So my next thought was simply to revert back to Windows seven using the built-in Restore program. But no! The only restore point accessible was when I installed Win 10, so that was not going to work. So, a trip to Computer Central here in Brazil, IN was my last resort. Fortunately the competant technician there was able to restore me back to my Windows 7, and all is again well.
I also have a fairly new Lenovo laptop with Windows 8.1 on it, and it works fine. I installed Windows 10 in April of 2016 and it works fine.
Windows 10 is a very invasive program, in that it tracks your every move. This, of course, is for ADVERTISING purposes. What a suprise. There are ways to defeat some of that invasivness, and you will probably want to look into that before installing Windows 10. Google does a lot of the same, and Facebook is getting just plain irritating with "targeted" ads. I can do without them-thank you anyway.