How to Check Your Windows Product Key
This wikiHow teaches you how to find a Windows activation key on your computer. You can use your computer's Command Prompt application to find the key, or you can use the free ProduKey application to locate it. You can also use ProduKey to pull the product key off of a crashed computer's hard drive. If you upgraded to Windows 10 during the free period, you don't have a product key, though you do have a digital license that you can access by signing into your Microsoft Account on a new computer.