The reason it didn't get the highest score is that the Defender wasn't able to eliminate 6 targeted attacks, in addition to 4 web attacks. They gave Windows Defender an AA rating, which is the second-best rating they could give. You don't want the Defender to keep telling you that there's a problem while there's really nothing to worry about.Īs for SE Labs, things were a bit different. It's worth noting that this test is highly sensitive to false positives, more than any other tests out there.įalse positives are nothing to worry about, but they do affect the overall user experience. On the other hand, The Austrian Lab AV-Comparatives detected a higher number of false positives, hovering around 20 per month. The false-positive rate came at 2.7%, which is actually quite decent.

On rare occasions, Windows Defender failed to detect some zero-day malware threats.ĪV-Comparatives have also concluded similar results around the 99% mark. The German Lab AV-Test found that Windows Defender can block over 99.9% of malware and only give very few false positives from time to time. Do I Need Anti-malware Software with Windows Defender?.How Do I Turn on Virus Threat Protection in Windows Defender?.How does Window Defender Compare to Other Anti-viruses.Microsoft Windows Defender Security Center.Windows Defender Review: Is This Microsoft Antivirus Software Enough?.

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