just set the firewall to medium for internet and low for trusted. I find I need to set the IP addresses manually. 192 - 168 - 0 - 1 for the main pc and sub mask 255 - 255 - 255 - 0 set the other pcs to 0 - 2 and 0 - 3 etc. and then have zone alarm only on the main pc. then click on add IP address and enter the no. of the other pcs. in the other pcs set the main pcs number as the gateway and dns.