Vista sees XP, not vice versa

I'm trying to share specific directories between two home computers, one is
Vista Home Premium on a wireless router, the other an XP computer hardwired
to the router. Both have working internet connections through the router.
The Vista machine sees the XP machine on the network diagram, and can see the
"Shared Directories" on the XP computer (when they are set to "sharing" in
the properties). So I know the both machines are on the network and can
share. I think this means the firewalls are correctly set.
However, the XP machine does not show the Vista machine on the network
diagram, and hence cannot access the Vista's directories, even though I have
designated them for sharing.

I have read Jack's networking links and cannot figure out what I am doing
wrong. Any ideas?

 

Hi,
Have you tryed to look at your simple file sharing on your xp machine and
make sure it is enabled ?
If that dose not work you can you a program like hamatchi to easily make a
vpn and
share files that way

 

I assume you mean the individual subdirectories are set for sharing. I have
done that on both the Vista & XP computers. I know it is working on the XP
as I can "see" the XP files from my Vista machine.
Both computers are on the network as evidenced by the fact that the Vista
machine's network diagram shows both.
However, the XP machine doesn't show the Vista machine when I go into the
XP's networking graphic.
So it's not an issue of sharing, it's just not there in the eyes of the XP
machine. Why not? What is the secret?