Windows? Yeah it's just a matter of playing with color schemes. Might require you to download a custom theme.
Now this picture is pretty interesting. This looks like linux, but then you see the apple on the monitor... So being a mac might explain why there is a such a fucking mess with all those icons on the desktop. However, the nmap scan (on the left) is legit. The IPs even check out so they hosted a live target for this shot. Which is cool. Looks like a disk usage analyzer in the bottom right. As far as the chat windows, I don't know what client is being used for that (if one at all). But considering you can only see the nic of the person he is talking to it's a private message separated out into a new window. Then again I don't recognize that little red man so I could be off.
Boils down to this. Go linux, you can make this happen in minutes.
"The quieter you become, the more you are able to hear..."
"Drink all the booze, hack all the things."