Problems with peer to peer XP networking

I have 3 XP desktops that I need to set up as a peer to peer network. Each computer has the same workgroup name and I set a printer and folder on one computer as shared. I also setup users and access to the shared items. I have done this many times with W2K with ease….
My problem is that I cannot access the shared items from the other two computers. Am I missing something here? I am tempted to re-format the drives and install W2K. Any advice would be appreciated. Thanks

FYI: I can ping each computer and tried the XP “Wizard” for workgroup networking. Also disabled the XP firewall.