I have been testing several versions of firewall, bitdefender, kaspersky, kerio, sunbelt, and some more. For now, I find that Bitdefender wins the gold medal, in my opinion. But still the antivirus within Bitdefender is not that powerful. I installed Avast 4 and tried to use only the firewall in bitdefender (disabling the antivirus of bitdefender) but conflicts happen between the two softwares when loading windows. Do you people, know the best firewall please?