Microsoft updates Windows Defender definitions for Windows 11 26H2 installation images, improving protection against malware ...

Microsoft released a new Defender update for Windows 11,10, and Server installation images. It patches backdoors and more.

Windows 11 and macOS include solid built-in malware protection. Here's what Defender and XProtect cover, what paid suites add ...

A researcher who calls himself Nightmare Eclipse published a free tool on September 19, 2026, that can quietly stop Windows Defender from installing its own virus-definition and platform updates, ...

A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk ...

Microsoft has resolved a known issue that causes incorrect alerts warning that Defender Antivirus was turned off after installing recent updates. In a Windows release health dashboard update on ...

This voice experience is generated by AI. Learn more. This voice experience is generated by AI. Learn more. New warnings are a mistake. Microsoft has now confirmed that new warnings alarming Windows ...

Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates. The security researcher ...

Best Antivirus Software Best Antivirus for Windows 11 PCs in 2026 Ranked Every Windows 11 PC comes with an antivirus already enabled. In fact, Microsoft Defender now scores well in independent lab ...

Recently, you often see claims like "Windows Defender is enough" or "You don't need paid antivirus software." This is a ...

When you opened Windows Security, you found that Quick Scan and Full Scan were no longer available. Looking at that screen, ...

The majority of the updates that come through Windows Update are for Windows Defender, and for good reason. Windows Defender helps make your antimalware and other security protections stronger.