It has been a hard fight for sure to getthe XP machine to see the Vista
machine and allow me to open a shared folder. Not sure what step did it,
but the last thing I did was allow all the ports specified in
http://www.microsoft.com/technet/net.../vista_fp.mspx
I manually added the ports below to both machines.

• UDP 3702
• TCP 5357
• TCP 5358
• UDP 137
• UDP 138
• TCP 139
• TCP 445
• UDP 1900
• TCP 2869

The XP box was only using the Windows Firewall, and the Vista box was
using CA Internet Security or something like that. Both machines are
wireless laptops, so I am not sure if that had anything to do with it.
Internet capabilities always seem to work through the router, though a
lot of the times the Vista Machine told me I only had Local Area. Not
sure how to tell the Vista machine it is really working. IE tests to
www.microsoft.com always seem to work even though the "repair" feature
didn't.

I had tired the Vista box to my XP Home destop here on my wired router,
and had few problems though again showed local area only even though I
could open www.microsoft.com via the browser. But my XP uses Norton's
Internet Security 2007 and not just the Windows Firewall. So I guess
Norton's it knew what ports to open.

Anyway, I hope this can help others, because it seem like a BUNCH of folks
are having similiar problems.