AVAST ANTIVIRUS FREE
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Avast is one of the top free antivirus packages around. It has a very good boot scanner that can be useful at digging out rootkit viruses. When you consider that this is the free version it's actually better than some paid for versions of antivirus.
COMODO INTERNET SECURITY
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Comodo Internet Security is our top pick. A fully comprehensive security package that will help to keep malicious software at bay and it's totally free.
Tip: when installing only choose to install the Firewall and Antivirus.
AVG ANTIVIRUS FREE
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Probably the most well known and popular of all the free antiviruses in this list. Download and install, it's that simple.
BITDEFENDER ANTIVIRUS
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Bitdefender is a very good choice of free antivirus especially for low powered systems. Minimal install that uses very little of of your systems resources but still manages to be incredibly effective. Top choice for Hybrid Notebooks that use Atom processors and have only 2GB ram.