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

Windows 11 had a rough 2025. We tracked the top 20 Windows 11 issues reported by Windows Latest, from failed updates to ...

Microsoft’s latest Windows 11 security update was meant to harden PCs against stealthy firmware attacks. Instead, it has triggered a fresh headache: some systems now refuse to power off properly, ...

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

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

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

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

A bug in Windows 11 is crashing Explorer.exe, which could make your desktop UI disappear, including the taskbar.

Microsoft's first Windows 11 update of 2026, specifically KB5034763, caused shutdown and restart failures for some users. This out-of-band update, released on January 17, 2026, addressed a ...