Avast Free Antivirus
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Full user review
Avast failed to detect more than 37 virus' and trojans.
Avast was running, and updated, on my aunt's Win XP machine. She was getting popups and browser re-directs: and it was horribly slow. I ran a full scan with Avast and it detected nothing.
I then ran Malwarebytes and installed Avira, and got more than 250 detentions, 37 being virus' as mentioned above.
About as secure as a screen door.