product key for windows 10 A Windows product key is a 25-character key that tells Microsoft that your Windows operating system is authentic. The way you find it will depend on how you received the product key initially, but if you can't find it, I recommend Magical Jelly Bean, which is a product key finder..
product key win 10 Learn different methods to locate your Windows 10 product key using the Command Prompt, software, or a Windows Registry script. The web page also explains the difference between OEM key and retail key, and why the registry method may not work.
product key win 10 Can I reinstall the Free Windows 10 on my computer after upgrading? If you have upgraded to Windows 10 with the free upgrade offer on an activated Windows 7 or Windows 8.1 PC, you will be able to do a clean install of Windows 10 on the same PC anytime in the future and activate Windows 10 with your Windows 7 or Windows 8.1 product key.
