Reinstalling Windows 10

Have a laptop, want to reinstall Windows 10:

Resetting lets you choose whether to keep your files or remove them, and then reinstalls Windows. To get started, go to Settings > Update & security > Reset this PC > Get started and choose an option.

If you can't open Settings, you can get to reset by restarting your PC from the sign-in screen. Press the Windows logo key  +L to get to the sign-in screen, then hold the Shift key down while you select Power  > Restart in the lower-right corner of the screen. After your PC restarts, select Troubleshoot > Reset this PC.

If you can't get to the sign-in screen, use a recovery drive or installation media to reset your PC.

Option	What it does
Keep my files	Reinstalls Windows 10 and keeps your personal files. Removes apps and drivers you installed. Removes changes you made to settings. Removes any apps your PC manufacturer installed. (If your PC came with Windows 10, apps from your PC manufacturer will be reinstalled.)
Remove everything	Reinstalls Windows 10 and removes all your personal files. Removes apps and drivers you installed. Removes changes you made to settings. Removes any apps your PC manufacturer installed. (If your PC came with Windows 10, apps from your PC manufacturer will be reinstalled.) If you're planning to donate, recycle, or sell your PC, use this option and choose to fully clean the drive. This might take an hour or two, but it makes it harder for other people to recover files you've removed.
Restore factory settings	Reinstalls the version of Windows that your PC came with (either Windows 8 or Windows 8.1) and removes your personal files. Removes apps and drivers you installed. Removes changes you made to settings. Reinstalls any apps your PC manufacturer installed on your PC. This option isn't available on all PCs.

https://support.microsoft.com/en-us/help/12415/windows-10-recovery-options