Microsoft ships emergency patch to fix Windows 11 startup failures

Microsoft has released an out-of-band update to address a known issue causing some Windows 11 systems to enter recovery and fail to start after installing the KB5058405 May 2025 security update. Users on the affected computers see 0xc0000098 recovery errors in ACPI.sys (the Windows Advanced Configuration and Power Interface driver, a Windows kernel-mode driver critical for power management and device configuration), warning them that the device must be repaired because the operating system couldn't be loaded. As Microsoft revealed when it acknowledged the issue on Thursday, this known issue affects Windows 11 22H2/23H2 systems in enterprise environments and mainly impacts Azure Virtual Machines, Azure Virtual Desktop, and on-premises virtual machines hosted on Citrix or Hyper-V. "We are investigating reports of the May 13, 2025 Windows security update (KB5058405) failing to install on some Windows 11, version 22H2 and 23H2 devices," the company said when it acknowledged the issue on ... Read full article.