AVG AntiVirus Free 2013
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Full user review
"Still the Best"
I've never gotten a virus while running AVG and now it provides less strain on my system than previous versions.
Tries to force the AVG toolbar on you as well as force AVG's own custom search page instead of whatever default you want. I don't want either of those things.
They also ditched their Gaming Mode which allowed you to temporarily disable the software for gaming so you could get maximum speed/resources out of your computer.
I've been using AVG Anti-virus since about 2007 because I read in a tech magazine that it had the highest block rate among free antivirus programs (and beat out popular paid ones such as Norton and McAfee). It's never let me down and continues to make improvements in usability. Where other suites act as though their approach to stopping virus attacks is bogging down your system so much that a virus won't be able to use it either, AVG allows my computer to run fast.