Access Issues With Mixed Vista / XP Network

We have tried to set-up a home network based around our new Windows Vista
desktop machine but have run into some problems.

All the machines are wirelessly connected to a Belkin router and can access
the internet fine. We have a desktop with Windows Vista that is connected to
a printer which works fine, however after running the Network set-up wizard
we cannot file share or print between the Vista desktop and a couple of XP
laptops.

Any one know of any good simple online guides for creating a file / print
sharing network with mixed O.S. machines, especially id they deal with the
'print server' machine being Vista, and the others being XP.

TIA

Neil