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

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

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

Microsoft has released the first Windows 10 update of 2026, an important security patch called update KB5073724. This update is available for users of Windows 10 21H2, Windows 10 Enterprise LTSC 2021, ...

Some machines are failing to start after security updates, prompting yet another Microsoft investigation Microsoft is ...

Just in case you thought Windows 11 24H2's issues were over, here's the latest headache from the good folks at Microsoft. It turns out that physical installation media (meaning CDs and flash drives) ...

Microsoft has linked recent reports of Windows 11 boot failures after installing the January 2026 updates to previously failed attempts to install the December 2025 security update, which left systems ...

There is a certain Windows 11 feature that, if turned off, requires a clean installation of the OS from scratch whenever you ...

Windows 11 shutdown bug explained with causes, fixes, and workarounds to stop restarts, battery drain, and failed power-offs after updates.