XP + Vista Home Network

I am attempting to set up a home networke between a Vista box (wireless) and a XP box (wired). The problems I’m having are, XP can see Vista on the network but cannot access, Vista can’t see XP.

Things I have tried:

Updated both machines to current levels.
Disabled firewall.
Re-installed TCP-IP.

I am just trying to share a printer. I have done this a hundred times with different home networks and never experienced so much difficulty. Any help would be great!