Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors ...

A Windows security update bug has prevented some Windows 11 24H2 and 25H2 users from booting into their PCs, requiring them ...

Windows 11 January 2026 updates may cause boot failures on some PCs. Microsoft is investigating issues linked to KB5074109.

Microsoft is shifting focus to fixing Windows 11 performance and reliability after months of buggy updates, boot failures, ...

Windows 11 KB5074109 (January 2026 Update) is causing major issues on some PCs, and Microsoft has more details to share.

Microsoft released unplanned updates over the weekend. They correct errors in the January patches and bring new boot certificates.

Windows 11 runs into another disastrous bug with its latest update — Microsoft admits an 'issue in which devices are failing ...

Microsoft is investigating reports of serious boot failures affecting Windows 11 devices following the January 2026 security ...

This comes just hours after reports that another emergency update has been issued by Microsoft to affect other problems ...

Another week, another big Windows problem.

Microsoft has linked recent reports of Windows 11 boot failures after installing the January 2026 updates to previously ...