AVG Anti-Virus Free Edition
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Full user review
"Excellent and free"
Well for starters It is free and it works better than over priced resource hogs like norton.
Updates usually need to be done manually. For some reason it doesn't always update on it's own.
I am an IT consultant. I have stripped many other programs off that are resource hogs and don't work well. I have recommended AVG for all my clients. I run it on all 5 systems in my office and have never had an issue after I switched from Norton in 2003. AVG is a major player in my tool kit.