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If you need to install or reinstall Windows 8.1, you can use the tool provided by Microsoft at microsoft.com called [http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media Create installation media for Windows 8.1]. If you’re not running Windows 8 or Windows 8.1, you’ll need to enter a Windows 8 or Windows 8.1 product key. You'll also need a product key if you're running Windows 8 and trying to install Windows 8.1 Pro.If you need to install or reinstall Windows 8.1, you can use the tool provided by Microsoft at microsoft.com called [http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media Create installation media for Windows 8.1]. This is an executable that you download and run to create install media while connected to the Internet. It requires Windows 7 or higher to run the media creation and download program. If you’re not running Windows 8 or Windows 8.1, you’ll need to enter a Windows 8 or Windows 8.1 product key. You'll also need a product key if you're running Windows 8 and trying to install Windows 8.1 Pro.