KB5077241 — February 2026 Cumulative Update Preview for Windows 11

Overview

KB5077241 is a February 24, 2026 cumulative update preview for Windows 11 that includes quality improvements and non-security fixes. This optional preview update brings systems to build 26200.7922 for version 24H2 and build 26100.7922 for version 23H2. As a preview update, it provides early access to fixes that will be included in the next month's regular cumulative update.

Affected Systems

This update applies to the following Windows 11 versions:

Issue Description

This cumulative update preview addresses multiple quality issues affecting Windows 11 systems, including:

• File Explorer performance degradation when browsing large directories with network drives
• Windows Search indexing failures for certain file types in OneDrive folders
• Intermittent audio crackling issues with USB audio devices after system resume
• Start menu responsiveness delays when launching applications from pinned tiles
• Windows Update notification persistence after successful installation completion
• Taskbar context menu display issues on multi-monitor configurations

Root Cause

The issues addressed in KB5077241 stem from various system components including file system enumeration logic, search indexer service, audio driver stack initialization, Start menu application launcher, Windows Update service state management, and display subsystem handling for multiple monitor scenarios.

Key Improvements and Fixes

File Explorer Performance Enhancement

This update optimizes the file enumeration algorithm in File Explorer when accessing network-mapped drives containing large numbers of files. The fix reduces CPU usage and improves responsiveness when browsing directories with more than 10,000 items. Changes include enhanced caching mechanisms and improved thread management for network I/O operations.

Windows Search Indexing Resolution

Addresses a regression in the Windows Search indexer service that prevented proper indexing of specific file types (.docx, .xlsx, .pptx) stored in OneDrive synchronized folders. The fix updates the search protocol handler to correctly handle OneDrive file attributes and ensures consistent indexing behavior across local and cloud-synced content.

USB Audio Device Stability

Resolves audio quality issues that occurred when USB audio devices were reconnected after system sleep or hibernation. The update improves the audio driver stack initialization sequence and ensures proper buffer management during device enumeration after power state transitions.

Start Menu Responsiveness

Optimizes the Start menu application launcher to reduce delays when launching applications from pinned tiles or the all apps list. The fix improves the application resolution cache and reduces dependency loading time for frequently accessed applications.

Windows Update Notification Management

Fixes an issue where Windows Update notifications continued to display even after successful update installation and system restart. The update corrects the notification service state synchronization and ensures proper cleanup of completed update notifications.

Multi-Monitor Display Improvements

Addresses display issues with taskbar context menus on systems with multiple monitors of different resolutions or scaling factors. The fix ensures proper menu positioning and rendering across all connected displays, particularly when using mixed DPI configurations.

Installation

KB5077241 is available as an optional preview update through Windows Update. Users can manually check for and install this update by navigating to Settings > Windows Update > Check for updates and selecting Download and install under Optional updates.

Alternative Installation Methods:

• Microsoft Update Catalog: Available for manual download and installation
• Windows Server Update Services (WSUS): Can be approved for deployment to managed systems
• Microsoft Intune: Available for enterprise deployment through update rings

Installation Requirements:

• Minimum 4 GB free disk space
• Active internet connection for download
• Administrator privileges required
• System restart required after installation
• Estimated download size: 890 MB for x64 systems, 680 MB for ARM64 systems

Verification Commands:

Get-HotFix -Id KB5077241
Get-ComputerInfo | Select WindowsVersion, WindowsBuildLabEx

Known Issues

Microsoft has identified the following known issues with KB5077241:

• Issue: Some systems may experience longer than normal boot times immediately after installing this update.
  Workaround: The issue typically resolves after 2-3 system restarts as the system completes background optimization tasks.
• Issue: Windows Defender Application Guard may fail to start on systems with less than 8 GB RAM after this update.
  Workaround: Increase virtual memory allocation or disable Application Guard temporarily until the next cumulative update.
• Issue: Some USB-C docking stations may not properly detect external monitors after installation.
  Workaround: Disconnect and reconnect the docking station, or update docking station firmware if available.

Uninstallation: If issues persist, this update can be uninstalled through Settings > Windows Update > Update history > Uninstall updates.