I’ve recently downgraded a machine from Vista business back to XP Professional, a process I will no doubt comment on at length later, and part of it included trying to install the drivers for the Xbox360 controller.

Trouble is, I installed service pack 3 first, and the installer is just smart enough to go: hey, I require service pack 1 or 2, service pack 3 is neither 1 nor 2, I’m going to throw up an error message and abort.

+1 point for checking system requirements as part of the install, I guess, but minus several thousand points for not considering the possibility that a future service pack might someday be released.