It looks like Windows 11 is giving Microsoft a hard time, as a new patch has just been released. The Redmond company released an emergency update on May 31, 2025, to fix a critical bug. The bug prevented the installation of a security update and could block some systems from booting. This "out-of-band" patch, meaning it was released outside of the usual update cycle, affects PCs running Windows 11 versions 23H2 and 22H2.
Microsoft quickly clarified that this problem was most prevalent in virtualized environments, such as Azure virtual machines, Azure Virtual Desktop, or those hosted locally via Citrix or Hyper-V. The update KB5062170 is cumulative, meaning it incorporates all previous fixes, including those from the May security patch. Please note that this update is not being distributed via Windows Update, and affected users will need to manually download it from the Microsoft Update Catalog. Don't panic if the KB5058405 update installed without a hitch: this new patch is not necessary.
The bug manifested itself by a rather worrying error message at startup: "Your PC/device needs to be repaired. The operating system could not be loaded because a required file is missing or contains errors." This message was accompanied by the error code 0xc0000098 and pointed to the ACPI.sys file. Suffice it to say that for the affected users, booting their system was simply impossible.
A small hiccup and a series of emergencies for Microsoft
One small drawback remains: Microsoft reports a known issue with Noto fonts in Chromium-based browsers (Edge, Chrome, Opera, Vivaldi) when the display scaling is set to 100%. While waiting for a fix, it is recommended to temporarily increase this scale to 125% or 150%.
This rapid intervention for Windows 11 is reminiscent of a recent precedent. Microsoft had already had to urgently release a similar patch for Windows 10, following problems with BitLocker after the May security updates. Two consecutive emergency patches for Microsoft's main operating systems in such a short time is sure to attract attention.
While Windows 12 is still not on the agenda, the Redmond company is still preparing for the end of Windows 10. The American giant's strategy is clear: rely on an AI-boosted Windows 11 to promote Copilot+ PCs.
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