Windows 11 appears to have a boot failure bug that's caused by an update failure bug, creating a circle of, err, bugs

Round and round we go.

Windows PCs ‘Suddenly’ Fail After Microsoft’s New Update

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

Microsoft investigates Windows 11 boot failures after January updates

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

Microsoft confirms Windows 11 KB5074109 January update BSOD, boot issues on some PCs (commerical)

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

'Devices are failing to boot': Why the latest Windows 11 bug could cause Microsoft more grief

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

Microsoft links Windows 11 boot failures to failed December 2025 update

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 ...
Houston Chronicle

How to Fix a Computer That Cycles During Startup

If one of your PCs fails to boot properly -- or is stuck in an endless boot cycle -- accessing Windows and your files may seem impossible. Troubleshooting and repairing a PC that reboots constantly ...