How To Retrieve OEM Windows Product Key From BIOS This is a very simple process on how to recover the Windows Licence Key from your BIOS. There is really no need to do this unless you want a copy of it. If you brought a Laptop with Windows 8, Windows 8.1 or Windows 10 pre-installed as a OEM licence then this video is for you. The licence key is stored in the BIOS and when your reinstall Windows the product key will activate automatically.