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 ...

Microsoft has released an emergency update for Windows 11 users after quite a few reported a big boot error following the May 2025 security update. The issue began ...

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

Use these fixes if your Windows PC is stuck in a boot loop after a BIOS update. Before proceeding, disconnect all peripherals and check if your PC boots into Windows. Press and hold the power button ...

Microsoft is aware of an alleged issue that leaves PCs unable to boot and requires manual recovery after Windows 11 January ...

Windows 11 KB5074109 is wreaking havoc thanks to several issues, with the most serious keeping users out of the operating ...

In confirmed cases, Windows 11 boot failure occurs post-update, with the machine stuck at a black screen and unable to ...

Some fixes feel satisfying in the moment, only to boomerang back as the same problem a week, a month, or a season later.

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