The Product Key for Windows 7, 8, 10, and 11 is a 25-character string. The product key can be found on your computer or on the outside of the Windows 11 DVD. If you're installing a copy of Windows, you'll need to enter a unique product key to verify the certificate's authenticity. This product key gets confirmed after a few minutes. The product key is not activated immediately, but the Windows application is activated after a specified amount of time has passed to ensure that it continues to function properly. During the product key activation period, you will receive a reminder to activate the Windows software, which will grow more frequently as time goes on.