If you have changed your computer hardware and find that your Windows has been deactivated, this post will show you how to re-activate your Windows license again. Here’s the thing: your free ...

This key is used to activate Windows on your computer. It’s a 25-character product key, and it’s important that you keep it noted somewhere. When you switch your computer or reinstall.

And that applies not only to Canary builds, as it was last month—from now on, only genuine Windows 11 and 10 keys can activate your computer running Microsoft's latest operating system.