I've always found this to be curious about installation instructions for computer peripherals; most commonly, installation of USB hardware in Windows XP.
Installation instructions typically insist VERY LOUDLY that you MUST install the drivers BEFORE plugging in the peripheral. Last example I saw specifically, a Microsoft Comfort Optical Mouse 3000 shipped with a cardboard tag folded over the USB plug that said "INSTALL DRIVERS FIRST!".
Why is this necessary? What happens upon plugging in a USB device that so thoroughly screws up your system that the included driver installers are rendered useless?