Avast Free Antivirus
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Full user review
"My least favorite antivirus"
It has that sandboxing feature which has potential.
It often fails REAL antivirus tests and reviews. It has very high false detection rate - it sandboxes and often alerts about almost any unknown (innocent) program. It is VERY chatty and otherwise noisy making it very annoying and disturbing the computer user (also scaring them if they are not very apt at computing). It is also very insistent on advertising its full (and trial) version. After testing it for a short time I wiped it with a vengeance, so annoyed I was by its behavior.
As an IT-pro I most certainly won't recommend this to any of my clients, lest I want them calling all the day wondering what are all the warnings about and why doesn't certain programs they use working properly any more. Also, I would STRONGLY recommend against it for programmers because of its behavior towards unknown programs; it has potential to do lenghty analyses of the freshly compiled binaries and there is always a risk that its trigger-happy heuristics flag your newest software build as malware.