Right-click on the Start button and click on Run.Ģ. In case of new computers, Windows 10 Product Key is embedded right into the UEFI/BIOS firmware and won’t be available on the packaging or stickers attached to the computer.ġ. Find Windows 10 Product Key Using Command Prompt The method to find Windows Product key varies, depending on whether Windows 10 was purchased from Microsoft, came pre-installed on your computer or was obtained by switching to Windows 10 from an earlier version of Windows. Windows Product Key: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX