When you reset your PC and remove everything: Microsoft has explained what’s actually going on under the hood here. This process is very similar to reinstalling Windows from scratch or using a manufacturer-supplied recovery partition, but is more convenient. This will restore the original version that came with your PC–so if your computer came with Windows 8, and you upgraded to Windows 10, it will reset back to Windows 8.

If your computer came with Windows pre-installed, you may also see a third option, “Restore Factory Settings”.