On a Windows 7 PC, examine your PC for a “certificate of authenticity” sticker with a key on it. You’ll have to find your PC’s product key if you do this. RELATED: How to Find Your PC’s Windows Product Key So You Can Reinstall Windows Be sure you have backup copies of all your important files from your Windows 10 PC first. You can then boot from it and reinstall Windows 7 or 8.1 fresh, telling it to overwrite the Windows 10 system already on your hard drive. Download the Windows installation media and burn the ISO file to a disc or copy it to a USB drive using Microsoft’s Windows USB/DVD download tool. Thankfully, Microsoft now offers easy downloads for Windows 7 and 8.1 ISO files. RELATED: Where to Download Windows 10, 8.1, and 7 ISOs Legally If you can’t downgrade to your old version (maybe it’s been to long, or maybe something went wrong with your downgrade attempt), you’ll have to perform a clean install of Windows-something PC geeks often do on new computers, anyway. That means that computer came with a product key that allows you to use Windows 7 or 8.1 on it.

How to Downgrade if Windows 10 Doesn’t Give You The OptionĪssuming you have an old computer you upgraded to Windows 10, that computer previously had Windows 7 or 8.1 on it.

Downgrading windows 10 to windows 7