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.

A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This key, which is a 48-digit number, is used to regain access to the drive.

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 …

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 …

Erfahren Sie, wie Sie einen Windows-Product Key für die Aktivierung finden und wann Sie stattdessen eine digitale Lizenz verwenden.

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 …

A security key is a physical device that you can use instead of your user name and password to sign in. Since it needs to be unlocked with a fingerprint or PIN, even if someone has your …

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