Learn how to check for the latest Windows Updates and install them to keep your device running smoothly and securely.

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

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.

This package includes monthly updates and fixes to the Microsoft Defender antimalware platform and engine that is used by Microsoft Defender Antivirus in Windows 11.

Microsoft Defender is a new security app that helps protect you and your family across all your devices; Windows, Android, Mac, and iOS.

Keeping Microsoft Defender Antivirus up to date is critical to assure your devices are protected against new malware and attack techniques. Update your antivirus protection, even if …

Oct 21, 2019 · See Manage Microsoft Defender Antivirus updates and apply baselines article for an overview on how updates work, and how to configure other aspects of updates (such as …

Oct 20, 2025 · Customers are recommended to update to this new engine build of Antivirus Engine (1.1.19200.5). To ensure any performance issues are fully fixed, it's recommended to …

Experience the latest Microsoft Windows 11 features. Learn how our latest Windows OS gives you more ways to work, play, and create.

Get this app while signed in to your Microsoft account and install on up to ten Windows devices.