antivirus proterction software

Presuming that you are talking about Win OS, I would
recomment EZ antivirus from computer. Its not really free but
you have one year of trial period.
Another freeware is AVG, http://www.grisoft.com/doc/1 I have
read lot of reviews about this one being good but haven't used
personally but I am using EZ at this moment with no worries, like
machine slowing down while using Norton (which I got with my
machine, such a pain!!

You will like AVG from Grisoft.

For being free AVG is a good antivirus. But I will say this, I have had multiple machines in my office that have had AVG, with it up to date, when i would scan the machine AVG stated no viruses detected. On my scanning with CA EZ Anti-Virus, on all occasions the CA found 20-50 viruses, and of those normally 10 variants starting with win32.

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