Printer driver installation x64 pro

I have extreme difficulty in installing a networked HP laser jet 5n.

HX network installer installed on an X64 based PC and finds the printer.
However the 3 options:

web check with HP fails to provide drivers

setup CD fails because there is no CD with x64 bit drivers

use drivers known to this PC (x64) also fails and asks for the windows 2003
server CD/DVD!! Insert the setup disk for x64 and it cannot find the missing
bits which are:
PCL5ERES.DLL
HPLJ5N.GPD
PJLMON.DLL
STDNAMES.GPD
TTFSUB.GPD
UNIDRV.DLL
UNIDRVUI.DLL
UNIRES.DLL
unidrv (help file)

I can install the printer via add/local so I know there are allegedly 64 bit
drivers - as described by the HP web site BUT:
I can find all the above via a search on my x64 pc but the HP installer
states that they are not compatible with my OS!!

my queries are:
1) are they really 64 bit
2) does anyone have a link to 64 bit drivers for HP Laser Jets (inc the 5n) ?