My guess would be that it's a recoding of some Linux GUI, or perhaps a personal build. i doubt you could pull off those text-links-as-icons in something like windows. Or anything that isn't open source, for that matter. *avoiding Win-centrism*

Point is, i don't know that there's any truly "easy" way to pull that off, unless anyone knows of a precoded desktop setup out there on the 'net or something.