Moreover, you’d see this nasty “Windows isn’t activated. They establish authorization and in case you cannot find the product key, you won’t be able to have access to actual home page wallpaper. The matter of product keys is a sensitive one. A lot of people find themselves unable to find the Windows product key that they got with it. You do that when Windows asks for it periodically. You do not need to activate the product key while installing Windows 10 or its Pro version. The product key that you get with your version certifies that your copy was not acquired by violating Microsoft’s copyrights. Whenever you make a software purchase online, you get a product key that proves/validates your legitimate purchase. A product key is also known as a software key.