Connect to a Vista PC using Windows Mobile 2003

I have an HP Ipaq rx3115 running Windows Mobile 2003 that I want to map a
network path to my Windows VISTA PC in order to use the attached printer. My
network is comprised of 4 pc's, 2 running Windows Vista Business and 2
running WindowsXP w/SP2. Using "File Explorer" on the Ipaq I can map a path
to each of the XP pc's with no problems, and access any of the shared folders
and files, however I get the message "The network path was not found." when I
try to connect to either of the Vista pc's. My DOS use of "Net View" shows
me all the correct naming conventions, so I know I'm typing them in
correctly. The printer is physically attached to one of my Vista pc's. There
must be something missing either from my Ipaq, or something that needs to be
installed on the Vista pc's to allow my Ipaq to connect to them? Any help
will be appreciated.
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Thanks,
Bill