Microsoft has released version 2 of their security software. It’s fast, it’s effective, and it’s free. I have been using it for about a year now, and can say that it hasn’t been obtrusive or a system resource hog as you may find with other free alternatives. Windows XP/Vista/7 owners can download their copy now.
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I concur. Before Security Essentials, I was suggesting the free version of Avast! to anyone asking for anti-virus advice. Security Essentials is by far the best and most efficient anti-virus out there. IMO.