I use BitDefender at work and it runs seamlessly with my system. It monitors all of my internet/IM traffic as well as performing regular system scans. It keeps itself updated and it's light-weight enough that I don't even notice it besides the occasional warning, which is a good thing. I've used a couple of other well-known brands before and they seemed to use a lot more resources than BitDefender to get the same job done. This is a great product for a great price.
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