KB5074105 — January 2026 Cumulative Update Preview for Windows 11

Overview

KB5074105 is a comprehensive cumulative update preview released on January 29, 2026, for Windows 11 systems. This update advances Windows 11 version 24H2 systems to build 26100.7705 and Windows 11 version 25H1 systems to build 26200.7705. As a preview update, it provides early access to quality improvements and fixes that will be included in the next regular monthly update cycle.

Affected Systems

This update applies to the following Windows 11 versions:

All editions of Windows 11 are supported, including Home, Pro, Pro for Workstations, Enterprise, and Education editions.

Key Improvements

System Performance Enhancements

The update includes significant improvements to Windows kernel performance, particularly in memory management and process scheduling. These optimizations result in reduced system latency and improved responsiveness during high-load scenarios. The update also addresses CPU utilization inefficiencies that could cause unnecessary power consumption on mobile devices.

Hardware Compatibility Updates

Microsoft has updated device drivers and hardware abstraction layers to support the latest generation of processors, graphics cards, and storage devices released in late 2025 and early 2026. This includes improved support for next-generation NVMe storage controllers and enhanced graphics driver compatibility.

Security Improvements

The update strengthens Windows security architecture by addressing multiple vulnerability classes including privilege escalation, memory corruption, and network protocol weaknesses. These improvements enhance the overall security posture of Windows 11 systems against emerging threat vectors.

User Interface Refinements

Windows Shell components receive multiple improvements including enhanced taskbar responsiveness, Start menu reliability fixes, and Windows Explorer performance optimizations. These changes improve the overall user experience and system reliability during daily operations.

Installation Requirements

Before installing KB5074105, ensure your system meets the following requirements:

• Operating System: Windows 11 version 24H2 or 25H1
• Disk Space: Minimum 4 GB free space on system drive
• Memory: At least 4 GB RAM (8 GB recommended)
• Network: Active internet connection for download and validation
• Permissions: Administrator privileges required

Installation Process

The installation process typically takes 20-45 minutes depending on system configuration and hardware performance. The system will restart automatically during installation to complete the update process. Users should save all work and close applications before beginning the installation.

Enterprise Deployment

Enterprise administrators can deploy KB5074105 using standard Windows update management tools:

Windows Server Update Services (WSUS)

The update appears in WSUS console under Preview Updates classification. Administrators must approve the update for deployment to target computer groups. Testing in a controlled environment is recommended before broad deployment.

Microsoft System Center Configuration Manager (SCCM)

SCCM administrators can create deployment packages for KB5074105 and schedule installation during maintenance windows. The update supports standard SCCM deployment features including progress monitoring and rollback capabilities.

Microsoft Intune

Intune-managed devices can receive KB5074105 through Windows Update for Business policies. Administrators can configure deployment rings to control rollout timing and monitor installation success rates.

Verification and Validation

After successful installation, verify the update using the following methods:

System Information

Check the installed build number using the following PowerShell command:

Get-ComputerInfo | Select-Object WindowsVersion, WindowsBuildLabEx

Windows Update History

Verify installation through Windows Update history:

1. Open Settings
2. Navigate to Windows Update
3. Select Update history
4. Confirm KB5074105 appears with successful installation status

Event Logs

Check Windows Update event logs for installation details:

Get-WinEvent -FilterHashtable @{LogName='System'; ID=19,20,21,22} | Where-Object {$_.Message -like '*KB5074105*'}