Microsoft rolled out update KB5058405 for Windows 11 23H2 to address critical security vulnerabilities, but users are reporting significant issues, including boot failures with error code 0xc0000098. This problem affects both Windows 11 23H2 and 22H2, primarily in virtual environments like Azure Virtual Machines and on-premises virtual machines hosted on Citrix or Hyper-V. Home users with Windows Home or Pro editions are less likely to experience this issue. The error indicates a missing or corrupted ACPI.sys file, which is essential for managing hardware resources and power states. Microsoft is currently investigating the issue and has not yet provided a resolution.