Microsoft Confirms Windows 11 Security Update Causing Boot Failures on Some PCs
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Summary
Microsoft has confirmed that the January 2026 Windows security update (released January 13) is causing boot failures on some PCs, with devices displaying the "UNMOUNTABLE_BOOT_VOLUME" stop code. This issue adds to numerous other problems reported since Microsoft's Patch Tuesday updates, and the company is actively investigating the reports.
Key quotes
· 3 pulledMicrosoft has received a limited number of reports of an issue in which devices are failing to boot with stop code 'UNMOUNTABLE_BOOT_VOLUME', after installing the January 2026 Windows security update released January 13, 2026, and later updates
This is on top of the plethora of other issues that have been reported since Microsoft's disastrous Patch Tuesday updates arrived
Microsoft has confirmed that some users might find their PC unable to boot after installing the January 2026 security update released on January 13
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