If you want to do a reinstall of your Windows operating system and you want to use the original product key but can’t find it, you may need some help to find it .
The Windows original product key it’s stored in the Windows Registry.
There are many ways to do it .
1. Using command prompt window, in Windows 10 / 8.1 in search type cmd and a black windows will open, then type the following command and hit Enter:
wmic path softwarelicensingservice get OA3xOriginalProductKey
Your Windows product key will be displayed.
2. Using PowerShell in Windows 10 / 8.1 in search type PowerShell and a black windows will open, then type the following command and hit Enter:
powershell “(Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey”
Hope this helps .