Vesta,

Just my opinion here...but if the firewalls are already enabled and the connections are working fine, leave them that way..Although the router you are using may have it's own firewall which may protect you from "outside" intrusion attempts, if one of the computers "inside" your network were to become infected with a "network aware" virus then it could easily infect all of the computers on your network unless protection is enabled...Keeping those enabled will provide protection against most network aware types of worms and viruses.

If you use "file sharing" on the network, you'll need to make sure that the "Exceptions" are allowed in the firewall settings. If you don't "need" file sharing between computers except in special situations, I recommend not allowing file sharing until you need it..

Hope this helps.

Grif