Computers not showing up on network

I just go a Vista based computer and I'm trying to access other computers on
my home network. None of the computers on my network are shoing up ont he
network list. My firewalls are disabled. All connections are secured.

Any suggestions.

One computer is running XP, the other 2000, and I also have a Playstation 3
hooked up to the same network.

I should at the minimum be able to see these devises. Shouldn;t I??

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