Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors ...
Windows 11 January 2026 updates may cause boot failures on some PCs. Microsoft is investigating issues linked to KB5074109.
Windows 11 KB5074109 (January 2026 Update) is causing major issues on some PCs, and Microsoft has more details to share.
Microsoft released unplanned updates over the weekend. They correct errors in the January patches and bring new boot certificates.
Tom's Hardware on MSN
Some PCs can't boot after latest Windows 11 security update, no fix in sight — mostly ...
A Windows security update bug has prevented some Windows 11 24H2 and 25H2 users from booting into their PCs, requiring them ...
Windowsのエラーで0xc00021aが表示されたら、どう解決すればいいか?Tenorshare社は2023年2月6日(月)にWindows Boot Genius V1.0.7をリリースしました。4DDiG Windows Boot Geniusを使用すると、Windowsのエラーを簡単に修正できます。 「0xc00021aというエラーが出るのはなぜなのか?
XDA Developers on MSN
Microsoft confirms that a stack of bad Windows updates is causing boot issues
It's not just January's one.
Microsoft is investigating reports of serious boot failures affecting Windows 11 devices following the January 2026 security ...
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