Lexmark x1270 Vista problem
I've had exactly the same problem for the last two years. The printer was sold as vista ready but came with an xp installer. No one has a solution and I've tried eveything. I now see Lexmark has a free utility download to remove all traces of the xp drivers which are hid in various Vista folders.
Thanks to the Seattle Times for their story on this problem. Because of the publicity Microsoft sent techs who disclosed the hidden xp remnants in Vista.