When I set up customers' computers (either brand new computers or after a re-install), I always make sure to install Flash Player so people can play YouTube. And in the spirit of mixing business with pleasure, I often pick a Dawn Upshaw clip.
I found this one today - it is one of my favourite arias. I don't particularly like the Rake's Progress, but this song is wonderful. And I would sit through the whole opera for this song alone. Particularly if it's sung by Dawn Upshaw!