How can I prevent insects, trojans, viruses?

So far I am using Zone Alarm free edition, AVG Anti-virus edition Free, AVG Anti-Spyware free edition (mainly for free resident shield), Spybot Search & Destroy (also mainly for its resident shield free), Spyware Blaster. What other software programs (I prefer to be free) are highly recommended? Thanks again in advance. I'm using Mozilla Firefox. Do I have to modify or leave it?

UVC is very

PR0 6AM3R’s Free Software Releases

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