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 ...

It's not just January's one.

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 ...

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

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

Everyone knows you need to keep your operating system up to date, but what happens when a company botches the update and ...

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

If you get the “Couldn’t find a bootable operating system” error while turning on your Surface laptop, use these fixes to resolve this error. Check if your SSD ...