I'm very cheerful with NANO AV but the most important things for
AV Security is FIREWALL and it's a basic option, i hope you get
this deal very soon!!!

There are plenty of freeware firewalls out there. Just try searching Google. Btw, I don't use a firewall since I know what runs on my PC and believe that NAV can detect the virus, etc. before it connects to the internet.

Zero3K, except viruses, there are hackers..
Firewalls help protect them.

Well, as long as you know what's running and keep it updated, hackers shouldn't be able to get your data, etc.