How to activate Windows Defender in Windows 10 and Windows 11 Other free and paid-for products may offer additional features, such as VPNs and online backup, but Defender is fine for day-to-day protection. No security product is flawless, but the strong results in three independent tests suggest Windows Defender is more than good enough to rely on for antivirus protection. The SE Labs consumer test for the third quarter of 2021 ranked Defender as the second best security product overall, with a protection accuracy rating of 96% and a perfect record when it came to reporting false positives.Īs Simon himself said in a recent tweet: “We test regularly… it has improved a lot.” Windows Defender verdict SE Labsįinally, SE Labs – run by my former colleague Simon Edwards – posts a third set of positive results for Windows Defender. It’s also worth noting that Windows Defender scores well in these tests for the minimal impact it has on PC performance. On AV-Test’s report card, Defender scored 100% protection against new (or zero-day) threats in both September and October, and it gave 100% protection against known threats in October, with 99.9% protection in September. Those results are backed up by AV-Test, who also give Windows Defender a ‘Top Product’ rating for its October 2021 tests (although an awful lot of other products get that award too). It did let through two threats, but that’s two in many hundreds of such attempts. The AV-Comparatives results show Windows Defender blocked 99.7% of the threats thrown at it in the company’s tests, and didn’t raise any false alarms at all.
In the latest test at the time of writing (December 2021), AV-Comparatives gave Microsoft Defender its highest three-star ranking for protection.
Let’s look at the independent evidence from three different security software testers: AV-ComparativesĪV-Comparatives conducts regular tests of all the major Windows security software packages, including software from Kaspersky, McAfee and Norton. However, Windows Defender (as it is now known) competes very well with even paid-for security suites. When Microsoft started bundling its own security software with Windows – it was called Microsoft Security Essentials in those days – it had a pretty ropey reputation.
Both versions of Windows build in Microsoft’s own security suite, Windows Defender, but is it good enough to rely on? First we’ll reveal how good Windows Defender is at stopping malware and then show you how to activate it on Windows 10 and Windows 11 if you decide to stick with it. If you run a Windows 10 or Windows 11 PC, you might well be wondering which antivirus software package to use on it.
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