Endless Windows installation pain

http://www.youtube.com/watch?v=vPnehDhGa14&feature=player_embedded I stumbled across this thanks to @tim_weber. Could there be anything more painful than upgrading and installing every version of windows to date? In terms of user experience, its probably one of the biggest hardships in the life of your computer. I'm quite impressed that its possible...but we always knew Microsoft has great engineers.

How many interaction patterns can you spot?