Microsoft's recent Windows 11 update, KB5058405, has been causing significant issues for users, particularly those operating within virtual environments. The update has led to critical system errors, notably the 0xc0000098 error associated with the ACPI.sys driver, leaving many systems unbootable and users seeking immediate solutions.
Understanding the ACPI.sys Error
The ACPI.sys file is integral to Windows operating systems, managing power settings and ensuring efficient communication between hardware and software components. When this file becomes corrupted or encounters issues, it can result in severe system errors, including the dreaded Blue Screen of Death (BSOD). The 0xc0000098 error indicates that the operating system cannot load due to a missing or corrupted system file, in this case, ACPI.sys.
Impact on Virtual Machines
Reports indicate that the KB5058405 update predominantly affects virtual machines (VMs), including:
- Azure Virtual Machines
- Azure Virtual Desktop
- On-premises VMs running on platforms like Citrix or Hyper-V
Microsoft's Response
Microsoft has acknowledged the issue and is actively investigating the root cause. The company has updated its Release Health dashboard to inform users of the problem and is working towards a resolution. As of now, no official fix has been released, and users are advised to refrain from installing the KB5058405 update until a solution is provided.
Potential Workarounds
While awaiting an official fix, users can consider the following steps to mitigate the issue:
- Uninstall the Problematic Update: If the update has already been installed and is causing issues, users can attempt to uninstall it by booting into Safe Mode and navigating to the 'Installed Updates' section in the Control Panel.
- System Restore: Utilize the System Restore feature to revert the system to a state prior to the installation of the KB5058405 update.
- Update Drivers: Ensure that all system drivers, especially those related to power management and virtualization, are up to date. Outdated drivers can exacerbate compatibility issues.
- Check for BIOS/UEFI Updates: Manufacturers often release firmware updates to address compatibility issues. Checking for and applying any available BIOS or UEFI updates may help resolve the problem.
The KB5058405 update for Windows 11 has introduced significant challenges, particularly for users operating virtual machines. While Microsoft is actively working on a solution, users are advised to exercise caution and consider the aforementioned workarounds to maintain system stability. Staying informed through official Microsoft channels will ensure users receive timely updates and solutions as they become available.
Source: Windows Report Windows 11 update KB5058405 crashes with 0xc0000098 error tied to ACPI.sys driver
