Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
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Full user review
"Very good but it could be lighter."
easy to use, minimal settings, somewhat light, great for basic home users, decent protection against viruses and spyware etc.
could be lighter on the system.
Remember, no Antivirus product is 100% safe, watch what you are doing online and use common sense to stay infection free.