Problem Networking with Vista

I am trying to set up home network with Vista and XP desk tops and internet
access via intelligent gateway (wireless router). Initially no computer and
devices were visible on my Vista desktop, but after installing LLTD patch,
atleast XP desk top is visible. Following the problem still persists.
1. File and printer sharing is not possible
2. Other devices such as PSP, Nintendo and other consoles are not visible on
my home network map (in Vista).
Any help will be gratefully accepted.
--
NaiveKid