If for some reason you lost the licence key to your windows copy and you don’t trust any third party company to recover it for you, you have no reason to fret. There is an easy way to do it via command prompt.
- First press Windows key + X
- Then Select Command Prompt (Admin) from the window that comes up.
- Then type exactly this into the command prompt window
wmic path softwarelicensingservice get OA3xOriginalProductKey