First, start by opening elevated cmd.exe on the Windows 10 Start menu.
1) In Windows 10, you can use the search box inside the Start menu. This box can be found in the bottom left corner and may say, “Type here to search”.
 You can also press the Windows key on your keyboard to bring up the Start menu.
2) Type cmd in the Start Menu and press CTRL + SHIFT + ENTER to launch the command prompt elevated
3) In Windows 10 / 8.1, type the following command and hit Enter:
wmic path softwarelicensingservice get OA3xOriginalProductKey
That should display your Windows Key
 Recover Windows product key using Command Prompt First, start by opening elevated cmd.exe on the Windows 10 Start menu. 1) In Windows 10, you can use the search box inside the Start menu.
