If it’s been fewer than 10 days since you upgraded to the Windows 10, or fewer than 30 days if you upgraded before July 29th, 2016:
You can go back to your previous version of Windows by going toSettings > Update & security > Recovery and selecting either Go back to Windows 7 or Go back to Windows 8.1. This won't affect your personal files, but it will remove any apps you installed after the upgrade to Windows 10. Learn more.
If it’s been more than 10 days, or 30 days if you upgraded before July 29th, 2016:
Check to see if you can restore your PC to factory settings. This will reinstall the version of Windows that came with your PC and remove personal files, apps and drivers you installed, and any changes you made to settings. Go to Settings > Update & security > Recovery > Reset this PC > Get started and look for Restore factory settings.
Or, 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 use it to do a clean install.
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Article ID: 1235b5b0-bf94-4b77-9cbd-1c1a8337070c - Last Review: Aug 4, 2016 - Revision: 8