Using an Upgrade Version of Windows for a New Installation
An OEM or full version of the operating system is designed for installation to an empty hard disk (a clean install). You can also use an upgrade version of the operating system for a clean install if you have a qualifying Windows version on CD or floppy disk to provide during the compliance check portion of the installation (the compliance check uses the existing Windows installation if you are performing an upgrade or a dual-boot installation). You can use the CD or floppy disks from the previous version (and sometimes two versions back) as qualifying media.
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