For most people using a supported and fully updated Windows 11 computer, yes: Microsoft Defender Antivirus and the other protections inside Windows Security are sufficient as the primary antivirus.

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 on Wednesday morning issued an emergency update to its Microsoft Malware Protection Engine, closing CVE-2026-50656 — the Windows Defender privilege-escalation flaw known as RoguePlanet — 29 ...

Before you proceed, you should know one thing. If you have a 3rd-party security software, these suggestions may help. But if Windows Defender is the only security software installed on your computer, ...

Microsoft Defender engine 1.1.26060.3008 patches a critical SYSTEM privilege flaw but may expose Windows 11 to a new disk exhaustion attack via cached ADS files.

Try the following suggestions to fix the Random Disk Usage Spike issue in Windows 11/10 computers: 1] Upgrade to the latest Windows version or build First and foremost, check the version of Windows ...

Last month, security researcher Chaotic Eclipse (better known as Nightmare-Eclipse) managed to bypass Windows 11's sophisticated BitLocker security feature using a USB stick. Nightmare claimed that ...

From malware detection and removal tools to real-time analytics and cloud-enabled protection, Microsoft Defender offers all these benefits to its users at no extra cost. To use it, just get the app ...

Microsoft fixed 570 flaws in its biggest-ever Patch Tuesday using AI, offering New Zealand's understaffed security teams real ...

A ransomware operation that emerged barely 19 months ago has claimed 91 victims — 11 of them in June 2026 alone — by exploiting a critical pre-authentication vulnerability in Citrix NetScaler ...

Microsoft Defender for Endpoint updates could disable protection on some Linux hosts after reboot; Microsoft withdrew affected builds and listed replacements.

Microsoft has quietly fixed the “RoguePlanet” zero-day in Microsoft Defender, closing the latest hole exposed by security researcher Nightmare Eclipse after months of public sparring over the ...