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

On some PCs, Windows 11 has been incorrectly warning that Microsoft Defender is turned off, even when it isn't, for almost ...

Want to know how to enable Windows Defender in Windows 11? In this easy step-by-step tutorial, I’ll show you how to turn on Windows Defender Antivirus and check your Windows Security settings to help ...

After installing the latest Defender Antivirus update for Windows 11, users have started reporting that their operating ...

Microsoft has fixed the bug that made Windows Security wrongly claim Microsoft Defender Antivirus was turned off. According ...

To disable Microsoft Defender on Windows 11, go to Settings > Privacy & Security > Windows Security > Virus & Threat Protection, click Manage Settings, and toggle off ...

Microsoft has resolved a bug that caused Windows Defender to crash after a recent security update, resulting in 0xc0000005 access violation errors on some affected systems.

Update, March 31, 2025: This story, originally published March 29, has been updated with an explanation of LOLBINS as well as further technical information regarding the Windows Defender Application ...