Just installed a new AirPort Express and set it up with my Dell 600 laptop running Windows XP Professional. Works great! However, when I fired up my wife's iBook (800/G3/Jaguar 10.2.8) it detects the Airport Express alright, but asks me for a password to join. I enter the PW I programmed on the unit using the Dell, but it keeps telling me it's the wrong PW. Now what? What's wrong?