Can't see PC's on same network?

We have Macs and PC's on our network. I can see both when I go to "Network" but a co-worker (also running Leopard but on an AirBook) can only see the other Macs.
I've checked every network setting on both machines and can't figure out what's wrong.

Just answered my own question!
My colleague had "allow only essential services" checked on his Security -> Firewall settings.
Interesting that with this on, he could still see all of the Macs, but he had to turn it off to see the PC's.
Thanks for playing!

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