Might I suggest an overall color scheme reminiscent of the relaxing "BSOD?"
Or maybe door knobs asking one to press "Shift-Alt-Delete" to continue. Of course, the exits should be plainly marked so the person could press the "Start" button...
Found this comment just now: "It will be great fun!
Every month when a new windows virus come out, you will be able to go to a Microsoft store and all the computers will be dead or locked down so you can not surf the internet.
Too dangerous, we can't let you do that.
Boy, that will sell computers!"
And even more...<
from PCWorld Magazine>, no less! Guess you can't say Windows users don't have a sense of humor!!