Avast Free Antivirus
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Full user review
"Best of all"
Of all the antivirus software I've used, tested for review, and done tech-support for, Avast has been the best. Has never crashed. Doesn't hog resources. Is simple to use. And most importantly, has always protected the computer from any threats.
Like any type of antivirus software, it has to load up on start-up and get the latest virus updates.
Runs perfectly on my newest to oldest hardware without flaw.