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

Some machines are failing to start after security updates, prompting yet another Microsoft investigation Microsoft is investigating reports that its January 2026 security updates are leaving some ...

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

As reported by Windows Latest, Microsoft has updated users in a support document that it is "investigating customer reports ...

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

Neowin also notes another dark side to this latest issue. “Interestingly, Microsoft came up with a technical solution for ...

Microsoft has had to issue two out-of-band updates to fix its buggy Windows 11 patch.

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

Microsoft has started rolling out new Secure Boot certificates that will automatically install on eligible Windows 11 24H2 ...

Microsoft has posted an online bulletin confirming that the company is investigating reports that state Windows 11's latest ...

Microsoft is in the middle of a Secure Boot certificate transition that many users will not notice until it becomes a problem ...