Changing PC’s OS and Keeping My Current iTunes Files

[5er driver]

I’ve got a Vista OS and the iTunes application currently on my C: drive that I want to format and put W7 on. All the music and video files that are linked to the iTunes application are on my D: drive. How can I keep the current iTunes configuration after installing the new OS? Are there iTunes files that I can copy off the C: drive before formatting it, installing W7, and put back on after reinstalling iTunes with the new OS and everything will be as it was?
Does that make sense? What I don’t want to do is lose my current iTunes libraries, back ups, configurations, etc. And I really don’t want to have to rebuild my libraries.