I know, I know, CRAAAZY you say. But it’s true. There is now a port of the KDE desktop for Windows. What was once the domain of only Linux may now be run on Windows as well.
Article:
http://arstechnica.com/open-source/news/2009/01/testing-kde-42-release-candidate-on-windows.ars
How to do it:
http://techbase.kde.org/Projects/KDE_on_Windows/Installation