Reset Windows (English)
Press the Windows-key on your keyboard or click on the magnifying glass in the lower left corner next to the Windows menu icon.
Type "Reset this PC" without the quotation (") and click on the matching search result.
Click on "Get Started" in the new window (example figure 1).
Choose "Remove everything".
Proceed with removing your files and review the settings, if everything looks good press "Reset".
Windows will now reboot and start the factory reset procedure, this can take an hour or two depending on your hardware.
When the OS reboots and you have to choose keyboard language, press Shift + F10 (some models require you to press Fn + Shift + F10) and type the following command: "shutdown -s -t 0"
(without " quotations), this will shutdown the PC and you're set.
DONE! Congratulations, you've now learned how to reset your Windows OS to factory defaults, good job!