Microsoft Warns Windows Users—Emergency Update Within Days

Another week, another emergency update for Windows users. Just days after it warned that May’s security update was failing for some users, the company has confirmed it has been working the issue and an emergency update is coming soon, telling Windows users it “plans to release an out-of-band update in the coming days.”

While this affects Windows 11 users, there are echoes of the emergency update for Windows 1o users earlier in the month. Microsoft was quick to acknowledge that it was “investigating reports of the May 13, 2025 Windows security update (KB5058405) failing to install on some Windows 11, version 22H2 and 23H2 devices.” As I reported when that news hit, an out-of-band update was the inevitable next step.

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If you’re affected by the issue, you will see a recovery error warning that “your PC/Device needs to be repaired,” and that “the operating system couldn’t be loaded because a required file is missing or contains errors.”

Microsoft has explained that this ACPI.sys driver issue and will likely display the error code: 0xc0000098. “The ACPI.sys file (Advanced Configuration and Power Interface) is a critical Windows system driver that enables Windows to manage hardware resources and power states.” The company has also warned that “there are also reports of this same error occurring with a different file name.”

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While some physical devices have been impacted, most reports of this update failure concern virtual environments, “including Azure Virtual Machines, ​Azure Virtual Desktop [and] on-premises virtual machines hosted on Citrix or Hyper-V.” That means it’s far more likely to impact enterprise rather than home users.

This is different to May’s other emergency update, which addressed Windows 10 updates failing with a BitLocker Recovery screen when trying to install May’s security update. “Windows 10 might repeatedly display the BitLocker recovery screen at startup,” the company warned, confirming that other out-of-band update.