Protect your privacy, identity, and devices with Windows Security. Explore Windows 11 security features like Microsoft Defender Antivirus that help keep you and your PC safe.

Download the latest security intelligence updates for Microsoft Defender Antivirus, Microsoft Security Essentials (MSE), System Center Endpoint Protection (SCEP) and other antimalware.

Dec 31, 2024 · In addition to Smart App Control, Windows 11 includes several other security features that work together to protect your device. These include enhanced security settings, such as secure …

Smart security Before you even start your PC, Windows 11 is at work. Safeguard your device from phishing, network, and cyber-attacks.

Protégez votre confidentialité, votre identité et vos appareils avec la Sécurité Windows. Découvrez les fonctionnalités de sécurité de Windows 11 telles que l’Antivirus Microsoft Defender pour protéger …

If your PC is not able to upgrade to Windows 11 you can: Stay on your Windows 10 device by enrolling in our Extended Security Updates program to stay protected through October 2026, or Move to …

Nov 18, 2025 · Today's threat landscape is more complex than ever. This new world requires a new approach to threat prevention, detection, and response. Microsoft Defender Antivirus, along with …

MS Security Essentials Definition Updates 3/28/2018 n/a 0 KB0 Definition Update for Microsoft Security Essentials - KB2310138 (Definition 1.263.332.0) MS Security Essentials Definition Updates 3/8/2018 …

運用 Windows 安全性保護您的隱私權、身分識別和裝置。 探索 Microsoft Defender 防毒軟體等可讓您和電腦保持安全的 Windows 11 安全性功能。

Jan 23, 2024 · Learn if antivirus software is necessary for Windows 11 devices. Find out about built-in protection and whether Windows 11 needs antivirus software added on.