After years of waiting, Windows 10 is finally here and, overall, it's excellent. Plenty of people who hated Windows 8 are jumping at the chance to upgrade and get back their Start menu, and even many Windows 7 users are excited to upgrade.
Unfortunately, new software always has bugs and we're hearing from people who upgraded and ran into problems. Knowing some people were going to have a hard time, Microsoft did the smart thing and included a "downgrade" option.
If you've upgraded from Windows 7 or 8.1, you have one month to go back. Go to Start>>Settings and choose the Update & Security icon. Then go to the Recovery section and under "Go back to Windows 8.1" click "Get Started."
Windows will ask why you're going back, give you some warning and then do its thing. It's simple, although it could take a while.