Windows 7 Key Microsoft Security Essentials - Free

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The 2nd model of Microsoft Protection Essentials changes its plumage to gray,Microsoft Office Professional Plus 2007, and adds far better heuristic detections and deeper hooks into the Windows firewall.
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Screenshot by Seth Rosenblatt/CNET)
When you install MSE 2, it'll automatically run a scan until you opt out. Notice that it will not take into account your laptop or computer safe till that initial fast scan has completed.
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Screenshot by Seth Rosenblatt/CNET)
A wonderful characteristic from the scheduler forces MSE 2 to be respectful of one's computer's processor usage.
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Screenshot by Seth Rosenblatt/CNET)
From Microsoft:

With Microsoft Security Essentials, you get high-quality protection against viruses and spyware, including Trojans, worms and other malicious software. Protection Essentials is easy to install and easy to use. Updates and upgrades are automatic, so there's no need to worry about having the latest protection. It's easy to tell if you're protected - when the Safety Essentials icon is green,Office 2007 Professional Key, your status is good. It's as simple as that.
When you're busy using your PC, you don't want to get bothered by needless alerts. Safety Essentials runs quietly within the background,Purchase Office 2010, only alerting you if there's something you need to do. And it doesn't use a lot of system resources,Office Professional Plus, so it won't get in the way of your work or fun.