Sharing files and printers and firewalls

Hi
I have a belkin G wireless network with one PC running xp pro and 1 laptop
running xp home. Both machines can share the broadband connection, but i
can't seem to share files or printers. They both have a mcafee firewall but
i had problems before the firewalls were installed. Now i can't ping the
computers which i read in another post is probably the firewall. Does
anybody know how to configure the firewall to allow access. Is it just a
case of setting the allowed ip addresses in the firewall software?

Thanks

Ben R