Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Learn how to upgrade from Windows 10 Home to Windows 10 Pro or Windows 11 Home to Windows 11 Pro, including how to use a valid product key or the Microsoft Store.

A product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow.

If you are using a Windows 10 device, start by running the automated Windows Activation troubleshooter in the Get Help app. It will automatically run diagnostics and attempt to fix most of the …

In summary, a product key is used during installation, while an activation code is used to activate the software afterwards. Both are essential for ensuring a legitimate and functional software experience.

Learn how to activate Windows using an internet connection, automated system, or live support advocate.

If you make significant hardware changes on your device, such as replacing your motherboard, Windows will no longer find a license that matches your device, and you’ll need to reactivate …

To find your Windows product key, see Find your Windows product key. If you have a digital gift card that's good for a game or app, see Redeem a gift card or code to your Microsoft account.