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

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

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It's not just January's one.

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

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

Another week, another big Windows problem.

The most recent January Windows Update is broken on a number of PCs, but at least virtual machines don't seem to be impacted.

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

Microsoft released unplanned updates over the weekend. They correct errors in the January patches and bring new boot certificates.

In a surprising turn of events, Microsoft has confirmed that its January 2026 security update, KB5074109, is causing significant boot issues for some Windows 11 users. This latest development ...

Microsoft is shifting focus to fixing Windows 11 performance and reliability after months of buggy updates, boot failures, ...