Microsoft has issued out-of-band updates to address a startup failure affecting Windows 11 PCs, particularly in virtual environments, following issues from the May 2025 Patch Tuesday updates. The problem arose from the installation of the May security update (KB5058405), which misidentified a critical system driver, ACPI.sys, as missing. This led to error code 0xc0000098, blocking Windows from loading. The fixes, KB5027397 for version 23H2 and KB5062170 for version 22H2, are strictly available through the Microsoft Update Catalog, addressing the issue without previous updates required.
Microsoft has released out-of-band updates to fix startup issues in Windows 11 PCs, primarily in virtual environments, caused by the May 2025 security patch.
The buggy May 2025 update led to a failure where Windows couldn't load due to the believed absence of a critical file, ACPI.sys, causing error code 0xc0000098.
While mainly affecting virtual environments like Azure and Citrix, the issue also appeared on some physical devices, prompting Microsoft to advise on out-of-band fixes.
Microsoft's fixes KB5027397 and KB5062170 resolve the startup failure for Windows 11 versions 22H2 and 23H2, available only through the Microsoft Update Catalog.
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