The bottom line: Microsoft Security Essentials 2 will protect you, and it will generally do it well. However, its impact on system performance could be improved, and it’s still a bit light in the tool belt.
Now in its second iteration, Microsoft Security Essentials (MSE) debuted as the lightweight, cloud-based successor to the paid security suite Live OneCare in 2009. Version 2 introduces deeper hooks into Internet Explorer and the default firewall in Vista and Windows 7. Security Essentials has begun to mature, although it’s still rough at the edges.
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Operating system: Windows XP/Vista/7