Establishing Network

Hi ppl,
i have 3 comps at home. In which one has two NIC, One is connected to the
internet cable connect and the other is connected to hub, from which other
computers access internet.

I want to setup a network so that i can access internet and share files as
well. In Xp i was able to do that using setup a network, adding a network
workstation, etc. But in vista such options are not there for LAN, i can see
only VPN and dial-up connection. How should i do that ??

Presently i m able to access internet in all the comps, by given
192.168..... address to d comp tat is directly connected to Internet but
flies sharing is not working..

Plz Help
-Hiren