GAAAAAAAAAAAAAAAAAAH!
That's an April Fools', right?
Just kidding...
Seriously though -- the WinXP setup music drives me positively insane. Whenever we get a new batch of laptops in at work, they sit there looping that damn music over, and over, and over and over again. That same chord progression drilling its way into my skull, with nary a hint of rhythm... unless you count that 'tap tap tap' at the beginning when the 'Help' button makes itself known. Dull, dull, dull
Worst of all, on a laptop with no physical volume control, there's absolutely no way to stop it! The drivers haven't loaded yet to make the hotkeys work. I end up grabbing a handful of 3.5mm headphone jacks out of the store and plugging them into the headphone socket of each machine. Yes - it bothers me that much