I spent my career in the software business, so everyone asks me for help. I had a grown man (60+) call me, in tears, after Microsoft fooled him into updating his perfectly wonderful Windows 7 computer to Window 10. Suddenly, he couldn't even figure out how to run his main programs, or do anything that he'd learned to do without even thinking, under Windows 7.
This was about eighteen months ago, and I showed him how to click on the "revert to Windows 7" button. So, if you've upgraded, you should be able to reverse the process easily. Too late for that now, but if anyone else gets tricked into this, let me know.
I still run Windows XP on my main computer, although it is dual boot and I can also run Windows 7, when I need it. Windows XP was the best O/S Microsoft ever created. Windows 7 is also quite good, but has enough differences that I never quite feel at home with it.
As for Windows 10, the total and unnecessary change in user interface leaves me cold. What is more, I cannot name even one advantage it has, for the user, compared to Windows 7. But the thing that keeps me from using it is the fact that it sends a HUGE amount of information to Microsoft and other vendors. There is a reason Microsoft decided to give it away for many months.