Avast Free Antivirus
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Full user review
"Best Virus Protection I've used"
Free & it isn't a resource hog like some other more expensive programs.
None that I have found yet.
Bottom line is this is hands down the best virus protection suite I've used. After using many of the paid programs this one gives all of them a real run for their money. It has not slowed down my computer like the others, runs seamless in the background, and I personally like the notifications that it has been updated for my own peace of mind. This free program provides all of the useful utilities that you would find on a full service paid program. With the others, viruses did find their way onto my pc every so often. I've been using Avast! for about 4 months now, and not a single virus. I also run Malwarebytes on demand for additional security and in the past, it detected viruses on my machine but not since I have been using Avast! I am a happy customer :)