Windows 11 KB5079391 Lets Users Toggle Smart App Control Without Reinstalling
Summary
Microsoft’s optional KB5079391 preview for Windows 11 24H2 and 25H2 lets users turn Smart App Control on or off without reinstalling Windows. The update also includes display, performance, and reliability changes; it contains no security updates.
Key points
- KB5079391 is an optional, non-security preview update for Windows 11 24H2 and 25H2.
- Users can turn Smart App Control on or off in Windows Security settings without a clean install; Microsoft says the feature helps block untrusted or potentially harmful apps.
- Display changes include support for monitors reporting refresh rates above 1000 Hz, native USB4 monitor connections, and improved HDR reliability.
- The update includes reliability improvements for running x64 apps in Windows Recovery Environment on ARM64 devices and for Windows Hello fingerprint on certain devices.
- Microsoft says there are currently no known issues. Users can install the update through Windows Update or the Microsoft Update Catalog.
Article Details
- Event Type
- Microsoft released the optional March 2026 preview cumulative update KB5079391 for Windows 11 versions 24H2 and 25H2.
- Impact
- The non-security update includes 29 changes. It allows users to turn Smart App Control on or off without reinstalling Windows; when enabled, Smart App Control helps block untrusted or potentially harmful apps. It also adds display, performance, and reliability improvements. Microsoft reported no known issues with the update.
Vendors
Products
Smart App ControlMicrosoft released preview cumulative update KB5079391 for Windows 11 24H2 and 25H2, delivering 29 non-security changes including Smart App Control and several display and reliability fixes.Windows 11Microsoft released preview cumulative update KB5079391 for Windows 11 24H2 and 25H2, delivering 29 non-security changes including Smart App Control and several display and reliability fixes.