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i have a firewall but on rare occasions i use it... i mainly have it turned off. and i hate 3rd party programs because they have trojans most of the time...
Well, first of all, since you have experimented with some viruses, you know how damaging they can be. Because of this, I would *always* have a firewall and an updated virus scanner enabled on your computer. The virus scanner will help protect you from viruses while the firewall will limit the ability of any Trojans you have on your system from accessing the Internet.