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It hasn’t been doing too well in recent independent test, and during an experiment for an Ars Technica article, it was woefully ineffective at detecting the malware they installed. As in 0% effective. These things ebb and flow, and some years, Security Essentials does well in testing, other years not so well. This seems to be one of those not so well periods. I would consider Avast or AVG instead of Security Essentials.