One can download eTrust antivirus software for free from sites
such as CNET download, bestshareware, or techserious. It is
reviewed by CNET as being a dependable antivirus software.
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AVG is a free antivirus program available on the internet. Other
options for free antivirus software are Panda Security, Immunet,
and, ZenOK. All are available for free via direct downloads from
their respective websites.
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You can find antivirus software on searches for free. I
recommend searching Trend Micro. This is a security system that
enables you to browse the web for free.
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As far as antivirus software goes, I would say AVG Free.