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

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

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.

Learn how to use the Activation troubleshooter to resolve common activation issues in Windows.

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 …

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.

Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. This article will help you troubleshoot and fix common …

It verifies that your copy of Windows is genuine and that critical Windows licensing files haven't been damaged, deleted, or removed. It takes only a few moments and lets Microsoft create a match …

Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.