How to uninstall Windows 10 and revert to Windows 7 or 8.1
Method 1: Using Windows 10 Restore Tool
Windows 10 offers a tool that allows go back to your old version of Windows (7 or 8.1) for one month after updating to Windows 10.
This is the solution that I recommend if you want go back to Windows 7 or 8.1. Here is how it works.
Enter “recovery” in the Windows 10 search box and select Recovery options.
In the section Downgrade to Windows (7 or 8.1), Click on the button To start.
To validate the uninstall from Windows 10, you have to tell Microsoft why you want go back to Windows 7 or 8.1
Select one of the reasons listed below then do next.
The next screen informs you of the consequences of this downgrade to Windows 10
Note: Be aware that you will not lose any documents or personal files. Microsoft still advises you to back up your files.
Except the apps you installed after updating to Windows 10 will be lost along with any settings you made in Windows 10.
Microsoft reminds you that you need to know your user account password. To not get stuck at the login screen of your old version of Windows.
Last step, click on Go back to Windows 7 or 8.1 to launch the uninstall from Windows 10.
And now you just have to wait while your Windows 10 degrades to an earlier version.
And here is Windows 10 has been uninstalled and you find your good old Windows 7 or 8.1.