Windows 11 January 2026 updates may cause boot failures on some PCs. Microsoft is investigating issues linked to KB5074109.
Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors ...
The most recent January Windows Update is broken on a number of PCs, but at least virtual machines don't seem to be impacted.
Microsoft is investigating reports of serious boot failures affecting Windows 11 devices following the January 2026 security ...
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