I wish my upgrade to Windows 10 (or X) had gone as well....
It said I had to install a new version of Skype, which partially uninstalled the old one, and failed at installing the new one. The Microsoft link to fix the error I was getting listed all the operating systems it worked on, but excluded Windows X
My scanner that had worked fine on Windows 8.1, 7, and XP, would not work on Win X, even after downloading and installing the Win X drivers.
The Restore button (between minimize and close) at the top right of each window didn't work. It decides where and what size each window would be, often maximized, even if I don't want that.
And numerous other small glitches
After two days of trying to make it work, I went back to Windows 8.1 So far the only thing I have had to reinstall is Skype, which now works fine.