Windows 11 might be the latest version of Windows, but if you still use Windows 10 and need to "clean install" the operating system, or install or upgrade to it for the first time on an older PC, ...

When you buy a copy of Windows 11/10, you get a product key. 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 ...

The Windows 10 product key — a 25-digit code included with every copy — acts as proof of an authorized purchase. You can download and use much of Windows 10 ...

Note: This article was originally published in January 2017. It has been updated multiple times since then to reflect the most current information. The most recent update was on January 18, 2025. When ...