Microsoft has posted an online bulletin confirming that the company is investigating reports that state Windows 11's latest security update has rendered some PCs unbootable.

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

Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors after installing the026 Patch Tuesday security updates.

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

Microsoft issues second emergency patch for Windows this month - update your PC today ...

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

Another week, another big Windows problem.

Windows 11 KB5074109 is wreaking havoc thanks to several issues, with the most serious keeping users out of the operating ...

Some machines are failing to start after security updates, prompting yet another Microsoft investigation Microsoft is ...

Struggling with Windows 11 Update Error 0x80070422? Discover proven fixes to resolve this frustrating issue quickly.

Windows 11 users report Microsoft Store and Windows Update outages, with app installs failing and Microsoft Store showing ...

Microsoft claims Windows 11 24H2 is its "most reliable" version, citing reduced failure rates and improved BSOD recovery. However, many users and tech sites dispute this, reporting widespread issues ...