The product key is a 25-character code that looks something like this: You can find it in your online order info, in the confirmation email for your purchase, or on the DVD packaging. Windows Setup checks that your PC meets all system requirements before it installs Windows 8.1 or Windows 8. If you’re upgrading to Windows 8, this PC must be running Windows 7, Windows Vista, Windows XP with Service Pack 3 (SP3), Windows 8 Release Preview, Windows 8 Consumer Preview, or Windows Developer Preview. If you already have the latest version of Windows 8 installed on your PC, you can update to Windows 8.1 in the Windows Store for free. If you’re updating to Windows 8.1, this PC must be running Windows 7 or Windows 8.1 Preview. Make sure you’re on the PC you want to upgrade. If you have purchased a Windows 8 Key online and you need an ISO file or need to do a clean install.

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