Suse_Firewall2 with ADSL router

Hi everyone We want some sort of protection for our LAN connected to a 3com ADSL router. Everyone (18 machines and a server) have internet access but we can't get the firewall 2 to setup properly error: failed services in runlevel 5 Suse_firewall2. Anyone got a similar setup and can help us? 18 computer Lan, squid to cache the www, samba, 7.3 mix of Linux and w98 machines. Thanks, Steve.