I've used AVG for years. It's quick, very good on resources, and is free for the basic version for home users. For business use, it's priced very reasonably, and has a great catch rate. The software updates several times a day from what I've seen.
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I am using NOD32 for my computer from last 3 years and its been doing the best for me. Currently i am using NOD32 5 the latest version. It never slow down your pc speed and give the best performance. I would also suggest you guys to go for it as its the best.