Activate Windows. You can activate Windows using a product key or a digital license. If you purchase a new PC that came with Windows, a box copy of Windows, or a copy of Windows from an authorized retailer, you should have a product key that came in the box or documentation.
You can enter the product key during the installation setup or activate it later through the Settings app. If you’ve recently changed your computer’s hardware, you can also reactivate Windows 11 to regain access to all features.