Dial-in to XP

I have a XP sp2 pro PC set up to accept a dial-in connection at my home. It is part of a 3 PC home network using a Linksys BEFSX41 router and Comcast cable to connect to the Internet.

When I try to dial into the XP PC from a Win2000 laptop in a hotel room, I can connect to the XP PC and access the Internet, but I can't see any shared files on the XP PC.

I have disabled all firewalls on the XP PC and the laptop.

The XP PC is Dell Optiplex 320, 1GB RAM, 3.4GHz Pentium CPU.

Any ideas on what I can do to access the shared files on the XP PC?

I have no trouble accessing them from the same laptop when it is plugged into the router at home.