Firewall To Run With Adsl And A Home Network

until now i have resisted the need for a firewall as i am aware of the difficulties firewalls can give to file sharing ect, plus i have a home network with 5 comps, and the last time i tried a firewall i couldnt figure out how to config it so itdidnt block the other comps

my network is as follows

adsl modem connects to my comp via ethernet

a second ethernet card in my comp connects to my 100mb 5 port switch, and all the other comps connect to this switch

so if you run a similar system and use a firewall, or if ya know what to use and which is best plz advise me as i dont wanna go through the same crap as last time

someone must have an idea plz

pick any firewall you like

zonealarm might be good if you have not used one before. I still like outpost. Just make sure you add the ip adresses of all the computers on your internal network to the safe list.