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.

Microsoft Defender automatically isolated a compromised QNET endpoint in 129 seconds, stopping a multi-stage attack before the payload could persist or spread.

Learn how BitLocker, passkeys, Microsoft Defender, and other Windows 11 security features protect your data, accounts, apps, and devices.

How I free up Windows disk space and shred sensitive data for free with open-source BleachBit ...

Scan and clean your PC with the Windows Malicious Software Removal Tool. Learn how to run it, check results, and remove ...

Use the following fixes if OneDrive is showing offline on your Windows 11 PC. Before proceeding, check for Windows updates manually. An unstable internet connection is the most common cause of this ...

Microsoft has released a security patch to address a Defender zero-day vulnerability known as "RoguePlanet," disclosed after the June 2026 Patch Tuesday. The flaw (tracked as CVE-2026-50656) was ...

Microsoft says a new Defender capability isolated a compromised device and stopped a ransomware attack in 128 seconds.

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 ...

Many Windows habits can make your PC slower. Some may have completely skipped your mind that they might be affecting your ...

A Storm-2945 campaign layers device code phishing onto hijacked hotel Wi-Fi to bypass MFA on Microsoft 365 accounts. Here's ...