Hello,
The Windows 7 product key is a 25-character code that's used to activate Windows and where you find it depends on how you got your copy of Windows:
- From an authorized retailer. The product key is found on a label or card inside the box that Windows came in.
- A new PC running Windows. The product key is pre-installed on your PC, included with the packaging the PC came in, or included on the Certificate of Authenticity (COA) attached to the PC.
- A digital copy from a Microsoft website. The product key is in the confirmation email you received after purchasing itor it may be distributed as a digital license if you bought Windows 10, in which case it doesn't include a product key. Learn more about activation in Windows 10.
- Free upgrade to Windows 10. If you upgraded to Windows 10 for free from Windows 7, then you should have a digital license instead of a product key.
Please visit this helpful article by Andre Da Costa onhow to purchase a Windows 7 product key for additional information. For more info about digital licenses in Windows 10, see Activation in Windows 10.
Hope this helps and let us know if you have any questions.