Security update KB5058405 for Windows 11 versions 23H2 and 22H2 is causing serious system boot problems. Affected computers fail to start, displaying a critical error with code 0xc0000098.
G. Ostrov
The May security update KB5058405 for Windows 11 operating system has proven problematic, causing widespread system failures on users' computers. The update, intended to fix critical security vulnerabilities, has instead rendered many systems completely inoperable.
Affected Systems
The issue exclusively affects Windows 11 versions 23H2 and 22H2. Virtual machines deployed in various virtualization environments have been particularly hard hit:
- Microsoft Azure virtual machines
- Azure virtual desktops
- Local virtual machines on Citrix and Hyper-V platforms
Problem Symptoms
After installing update KB5058405, affected computers cannot boot and display the following error message:
"Your PC/Device needs to be repaired. The operating system couldn't be loaded because a required file is missing or contains errors. File: ACPI.sys. Error code: 0xc0000098"
Technical Root Cause
The error is related to corruption of the ACPI.sys (Advanced Configuration and Power Interface) file - a critically important Windows system driver. This component is responsible for managing hardware resources and power states. Without it, the system cannot initialize properly.
Microsoft's Official Response
Microsoft has officially acknowledged the problem and stated they are actively working on a solution. Currently, no ready fix has been offered, and users are advised to wait for an official patch.
Who's at Risk
The main impact has been on enterprise users and IT administrators who use virtualization. Home users of Windows 11 Home and Pro editions are less affected, as they rarely use virtual machines in daily operations.
For up-to-date information on the problem resolution, it's recommended to monitor official updates on the Microsoft Support website.
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