Config for someone new to firewalls?

I was debating on whether or not to install this firewall on my girlfriends mum’s PC because I think she would get confused as to what to allow and what not to allow and/or block so does can anyone recommend me a config to keep things as simple as possible?

Do you really mean Comodo Firewall v 2.4?

I use these settings for it;msg19293#msg19293;msg42264#msg42264