I have an HP Designjet 500 (large format color) printer. It is installed on a win xp pro machine directly and shared on the network. All Win XP Pro an Win 7 Pro (32 bit) pc's can hook up to it but not Win 7 Pro 64 bit. I have found what I think is the correct driver for win 7 pro 64 bit but when I install it it says the correct printer driver is not installed. I am trying to install this printer on a new Win 7 Pro 6bit hp laptop.