Windows directory is Winnt

I installed Windows 2000 and upgraded to Windows XP Pro. When I looked at the directory for Windows, it showed up as Winnt. I can’t change it when I install Windows 2000. How come? Is there a way to change it and still have everything work ok? I also don’t have a directory for LogFiles under the directory Winnt. Is this because of the directory called Winnt?

Thanks for any help you can provide.