
On the other side of the spectrum, the AV programs that did very well and received full scores from the AV-TEST comparison include Avast Free Antivirus and One Essential, AVG Internet Security, Avira Internet Security, AhnLab V3 Internet Security, BitDefender Internet Security, G Data Total Security, Kaspersky Internet Security, K7 Total Security, Malwarebytes Premium, and Norton 360. It is worth noting that Microsoft Defender shared the last spot with PC Matic, but the latter still received better scores than Defender on the Protection and Performance fronts. However, this is, by far, the worst showing by the AV, meaning something must have gone wrong with the program in the past few months. While the company has received some high scores from time to time, it has also sometimes fallen short of the expected levels. Microsoft Defender's performance on AV-TEST's evaluations has often fluctuated.

This is the first time the test was carried out on Windows 11, while the other recent tests were all done on Windows 10. The only category where it got 6/6 was usability. On the former, it received 5.5 out of 6, while on the latter, it received just 4.5. The software received 16 points among a possible 18, failing to get a full score on either Protection or Performance. The tests, which were conducted in July-August 2022, placed Microsoft's in-house AV dead last among 19 tested products.

Tests conducted by cyber-security assessment firm AV-TEST suggest that Microsoft Defender could be one of the worst AV programs for Windows 11. Related: Fake Windows 11 Upgrade Has Data-Stealing Malware added Kaspersky Lab to its list of national security threats and warned users that its AV software could be used by Russia to spy on Western targets. However, the Moscow-based Kaspersky has come under the scanner recently for its alleged ties with the Kremlin. Some of the most well-known Windows AV-makers include Avast, Avira, AVG, Kaspersky, BitDefender, Malwarebytes, and more. However, users can choose from dozens of different antivirus programs to keep themselves safe on the internet, and many of the most popular ones come for free.

Malware is a massive issue across all platforms, including Windows.
