Here are some things you can try to go back to Windows 7 or Windows 8.1.
- Select the Start button > Settings > Update & security > Recovery. Then select Get started under Go back to the previous version of Windows 10. This will keep your personal files, but it’ll remove apps and drivers installed after the upgrade as well as any changes you made to settings. The option to go back to your previous version of Windows is only available for a limited time (10 days in most cases) following the upgrade.
- Try restoring your PC to factory settings. This reinstalls the version of Windows that came with your PC and removes personal files, apps, and drivers you installed, plus any changes you made to settings. Go to Settings > Update & security > Recovery > Reset this PC > Get started and locate Restore factory settings.
- If you have a product key for your previous version of Windows, use the media creation tool to create installation media for Windows 8.1 or Windows 7, and then perform a clean install of Windows.