Where can I find a Good Free Computer Security Software thats free?

i need to find a good one thats free and can scan and fix without buying the actual package (i already did Norton anti virus)

Japan outlaws the creation of computer viruses – THINQ.co.uk

Japan has passed a law making it a criminal offence to create or distribute computer viruses, plugging an important legal … having previously struggled to bring the perpetrators of cyber-attacks to justice. The legislation also brings the country in …
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How can I stop an Anti Virus site which blocks and saying that my computer don’t have the security?

I am using Avast Anti Virus free software. But sometimes, another anti-virus site blocks and say that I don’t have the Anti Virus Security and asks to use their product. At once their soft ware begins to run till I stop it. I like to know whether it is normal and do I have any problem in my computer.

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

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!