Microsoft's security product performed worse than all other products of the test. As the system load is considerably higher than that of the other products, Defender lost an entire point, thus ending up at 5 out of 6 points.' The default Windows antivirus solution got perfect scores in the protection and usability category, but the worst score in the performance category.ĪV-Test writes: 'The highest system load in the test was generated by Windows Defender Antivirus for consumers. Microsoft Defender Antivirus scored 17 out of 18 points. The six products that performed the best in the test are: Avast Free Antivirus, Avira Security for Windows, Bitdefender Internet Security, G DATA Internet Security, Kaspersky Internet Security and Trend Micro Internet Security. Products may earn up to 6 points for each of the three test categories. A total of six of them scored 18 points, the highest available score. Most products performed really well in the test. Engineers at the institute analyzed the protective capabilities of the products, their usability and also performance. The latest Windows security software test by AV-Test analyzed 18 different security products for Windows.

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