I've been building my own computers since Windows 98. The last several systems I put together have been Windows XP; I've avoided Vista because of all the nasty reports. Since Windows 7 has been getting great reports I decided finally to build a system with that, so I bought Win 7 Home Premium OEM. Now on the package it tells me this "must be preinstalled . . . using the OEM Preinstallation Kit." I went to the Microsoft website mentioned on the package to download this kit (whatever "preinstallation" is), and there it indicates that I need to create an account in the "OEM Partner Center." Is this really something I have to (or should) do? I'm getting the impression that it's something that pertains to people or companies that build systems for profit. I'm just a hobbyist. Over the past 12 years I've built a number of systems with various versions of Windows, both full retail and OEM, and have never seen anything like this "OEM preinstallation" business before.