The second requires a bit more work, but is far faster, because you don't have to sit through a second install. This is the Microsoft approved way of doing this with an upgrade disk. After the second install, delete the Windows.OLD folder (since it's pointless), and activate using your upgrade key. The first method is fairly self-explanatory. At this point, you can either: a) start an upgrade install of Windows 7 on top of the new install, or b) modify the registry and reset the license manager to let you activate the current install. When it is done installing, you will have a clean, full install that you can't activate with an upgrade key. This first install will not have a product key until later. Further, uncheck the box to allow for automatic activation. At a certain point in the stall, you are asked for a product key. The installer will configure your partitions for you. (there should be no partitions at all) Then, clean install Windows 7 to the disk. When you are done, you should have nothing but unallocated space. I use a Linux system rescue disk, but you can accomplish the same thing by running a custom install and deleting all of the partitions. Assuming your hard disk has already been formatted, I would recommended erasing it again.
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