“What is the best free antivirus software out there?”
If you’re using Microsoft Windows XP, Vista, or 7 I would definitely recommends Microsoft’s own anti-virus program called Microsoft Security Essentials which you can download for free from the link below.
Download Microsoft Security Essentials
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
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Other notable free anti-virus software worth checking out:
AVG Free Edition
avast! Free Antivirus