If your Windows product key isn't valid, if you don't have a Windows product key, or if you lost the product key that came with Windows, you'll need to buy a new one to activate Windows. You must activate Windows online or by phone within 30 days of installation to use every feature of Windows.
To buy a new genuine Windows product key, go to the genuine Windows website, check to see if Windows on your computer is genuine, and then follow the instructions to buy a new product key.
If you already have genuine Windows and want to get additional product keys so you can install Windows on other computers, go to the Additional Licenses website.
You can find your product key on your computer or inside the Windows package.
Go to the Microsoft website to see examples of product key stickers.
If you can't find your product key, you might need to buy a new one. To learn how, see Get a new Windows product key.
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