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 …

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

When you get a message that says Windows can't be activated, there are several possible reasons why. Select any of the following topics to see some typical reasons for activation …

Support for Windows 8.1 ended on January 10, 2023. We recommend you move to a Windows 11 PC to continue to receive security updates from Microsoft. When you begin activation, …

When you get a message that says Windows can't be activated, there are several possible reasons why. Select any of the following topics to see some typical reasons for activation …

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

If the troubleshooter detects a valid Windows 10 digital license for an edition not current installed, it will let you know, and show you how to install the correct edition.

Windows 10 should automatically activate unless you made significant hardware changes (such as replacing the motherboard). For additional troubleshooting steps, please see Get help with …

Dec 5, 2025 · If you need help downloading, installing, or activating Windows or Office, need technical support or have any account & billing related questions, select the Get help button …

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

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 …