Windows 11 KB5074109 now linked to boot failures

[Redaktion]

Microsoft's troubled Windows 11 KB5074109 January 2026 update is now under investigation for causing UNMOUNTABLE_BOOT_VOLUME boot failures on some systems. Affected PCs refuse to start and must be recovered via WinRE, adding a serious new symptom to an already messy Patch Tuesday.

https://www.notebookcheck.net/Windows-11-KB5074109-now-linked-to-boot-failures.1212711.0.html

[tfk, the5krunner]

this update is a disaster causing everyone here multiple problems.
uninstall fixes it but I've spent over a day fixing corrupted pst files for me and some others.

[Bizarro_NikoB]

this update is a disaster causing everyone here multiple problems.
uninstall fixes it but I've spent over a day fixing corrupted pst files for me and some others.

Must be only certain systems affected. I haven't had any issues with my debian build.

[othman]

Why is Microsoft so determined to destroy this system?

Is it because they don't have enough staff? Why don't they use artificial intelligence to test the software, or are they only using it to improve (or rather, destroy) it?

This has gone too far. We need someone to save us from this company and invest seriously in improving a Linux distribution, even if it's a paid Linux distribution.