The Best way to protect computer. Security suites or Individual soft-wares?

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Im currently using:
Windows XP SP2 – currently updated!
Comodo Firewall – Latest and updated!
Avast 4.7 Professional – updated everyday!
Spybot S&D – updated weekly!
Tuneup uttilities 2006 – updated monthly!

thats about it! So is it better to have Individual softwares to protect my computer or do i need to buy one of those expensive, profesional lookin Internet security suites?

so what will it be?

please answer only positive comments!

Agent.btz Worm Won’t Die After 2008 Attack On Military – Huffingtonpost.com

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The attack established what Deputy Defense Secretary … plans into the hands of an unknown adversary,” he said. EVADES ANTI-VIRUS DEFENSES Anup Ghosh, a former senior computer scientist at the Pentagon’s Defense Advanced Research Projects Agency (Darpa …
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How do I tell Verizon Security Suite that a program on my computer is NOT a virus?

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I have a program on my computer which connects to the Internet. Verizon Security Suite thinks the program is a trojan or virus. How do I get Verizon Security Suite to no longer recognize a particular program on my computer as a threat?

What do you do when PC Security Software has taken over your computer?

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I have seen several posts regarding PC Security Software and all of these suggestions on how to remove it, BUT what do you do when it has already infected your computer to the point where all of the icons are gone, it blocks access to control panel, and it tells you that you can’t do anything because spy ware has infiltrated the computer? This is on my father’s computer, just trying to help him out! If any of you can help, that would be great!