What firewall do you use and trust?

[Deep900]

Comodo Firewall is more than a simple firewall, it can be also good to block several malware if well tweaked, but if it is not properly tweaked it can cause unwanted blocks or problems and crashes. I can suggest you to simply use Windows built-in firewall, which is very good in my opinion, otherwise you can try software suggested above or also for example Evorim Free Firewall.