Cannot print: Vista x64 / Minolta 2350EN / TCP Connection

Hello --

I hate to add to the collection of problems already posted here but I have
just about exhausted research resources and need help.

Equipment is as follows:

Desktop computer with XP Pro. The desktop is connected to a Westell 2200
via a hub.
An older HP laptop computer with XP Home is also connected to the hub.
The printer is a Minolta 2350EN, which is set up as a network printer via
TCP/IP, is connected to the hub.
Am able to share files and printers on all of these units without

New laptop computer is an HP DV4t, with Vista x64 Home Premium operating
system. It came with Norton Internet Security, which I mention just in case
it is relevant to the problem. UAC is currently turned off.

After nearly a week of effort, I have managed to get the file sharing
working between all three computers but cannot print to the network printer
from the Vista x64 computer.

According to the Konica-Minolta website, the drivers which come with Vista
are what I should be using. Have installed the drivers on the new laptop.
Have added the printer (several times) first as a local printer then
(several times) as a network printer but cannot get any output -- neither a
Windows test page nor a printed page from any application. Either Windows
or an application goes through the motions aand the document briefly appears
in the print queue, after which an error appears which only indicates
Error - Sent to Printer.

Would appreciate any suggestions for what I might try next.