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.

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 …

For help finding your product key, see Find your Windows product key. For troubleshooting and other info about updating Windows 10, see Windows Update: FAQ or Troubleshoot problems …

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 …

Scopri come trovare un codice Product Key di Windows per l'attivazione e quando userai una licenza digitale.

Pelajari cara menemukan kunci produk Windows untuk aktivasi, dan kapan Anda akan menggunakan lisensi digital sebagai gantinya.

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

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 …