Download Free Antivirus?

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avast! antivirus must be good choice.
Click below link for free download for home use:
http://www.avast.com/eng/download-avast-home.html

OR (not AND!)

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Microsoft recently made Microsoft Security Essentials software for free:
http://www.microsoft.com/Security_essentials/

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Among Many others:

Click below for Free & Commercial Antivirus list for excellent Windows 7
http://www.microsoft.com/windows/antivirus-partners/windows-7.aspx

Click below for Free & Commercial Antivirus list for Windows Vista
http://www.microsoft.com/windows/antivirus-partners/windows-vista.aspx

Click below for Free & Commercial Antivirus list for Windows XP:
http://www.microsoft.com/windows/antivirus-partners/windows-xp.aspx