Microsoft kicked off 2026 with a disaster that has Windows 11 users scrambling for solutions.
The KB5074109 security update, rolled out on January 13 as part of the company’s monthly Patch Tuesday, has triggered a cascade of problems ranging from random black screens to completely frozen applications, forcing the tech giant to do something unusual: tell users to uninstall the update.
The mandatory security patch, which bumped Windows 11 versions 24H2 and 25H2 to builds 26100.7623 and 26200.7623 respectively, was supposed to deliver routine security fixes and improvements.
Instead, it’s become one of the messiest Windows updates in recent memory, affecting everything from basic desktop functions to critical business applications.
When security updates become security threats
The problems started appearing almost immediately after installation. Users with Nvidia GPUs began reporting random black screen flashes where the desktop freezes for a second or two before snapping back to life.
Some found their wallpapers reset to black regardless of their settings, while others discovered that File Explorer stopped respecting desktop.ini configurations entirely, a feature many power users rely on for custom folder names.
But the real chaos hit businesses running classic Outlook with POP email accounts. The update caused Outlook to freeze completely when opening or saving files stored on cloud services like OneDrive or Dropbox.
Users reported missing sent items, emails downloading multiple times, and the app hanging so badly that even Task Manager couldn’t kill the process. One frustrated user described spending days trying repairs and profile resets before finally uninstalling KB5074109 as the only solution that worked.
Azure Virtual Desktop and Windows 365 users got hit hard too. The update broke Remote Desktop authentication entirely, blocking access to Cloud PCs with credential prompt failures. Microsoft acknowledged this issue quickly and released an out-of-band fix (KB5077744) on January 17, but other problems remain unpatched.
The fallout continues
Perhaps most frustrating are the installation failures. Many users can’t even get KB5074109 to install properly, the update times out at 35% or throws error codes like 0x800f0922 and 0x800f0905.
Microsoft confirmed these failures stem from servicing stack inconsistencies, essentially meaning the update conflicts with existing system files. The company’s advice? Wait for another out-of-band fix.
Reports on Microsoft’s support forums paint a picture of widespread frustration. A payroll processing company reported their remote applications closing immediately after login, forcing daily uninstalls until the update stopped letting them uninstall it at all.
Users with high-end RTX 4090 GPUs experienced system crashes during rendering, complete with KERNEL_SECURITY_CHECK_FAILURE errors. Even sleep mode broke on some systems, with PCs either refusing to sleep or rebooting randomly instead.
Microsoft has acknowledged several issues and fixed a couple, including shutdown problems on Windows 11 23H2 and some Remote Desktop failures, but critical bugs like the Outlook freeze remain under investigation with no timeline for a fix. The company says it’s coordinating with teams to remediate issues and prevent further impact, but users are left in limbo.
For now, Microsoft’s official guidance for affected users is straightforward: uninstall the update.
Head to Settings > Windows Update > Update history > Uninstall updates, find KB5074109, and remove it. Make sure to pause updates for at least a week to prevent Windows from reinstalling the problematic patch automatically.
It’s a rough start to 2026 for Windows 11, and it raises the same question users ask every time: why does installing Windows updates still feel like playing Russian roulette?
Until Microsoft releases proper fixes, possibly with the February 10 Patch Tuesday or another emergency update, users stuck with broken systems have little choice but to roll back and wait.
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