You probably have downloaded January’s KB5074109 Home windows replace and can not seem to get previous boot, you are not alone.
As reported by Home windows Newest, Microsoft has up to date customers in a help doc that it’s “investigating buyer studies of system boot failures following the January 2026 replace and later updates.”
The doc says, “Microsoft has acquired a restricted variety of studies of a difficulty during which units are failing as well with cease code ‘UNMOUNTABLE_BOOT_VOLUME’, after putting in the January 2026 Home windows safety replace (KB5074109), launched January 13, 2026, and later updates. Affected units present a black display with the message ‘Your system bumped into an issue and desires a restart. You possibly can restart.’ At this stage, the system can’t full startup and requires guide restoration steps.”
This isn’t the one drawback that has popped up on this month’s updates. January 24 noticed the launch of a shock replace, which patched a difficulty with apps changing into unresponsive when saving information on the cloud.
Microsoft has solely indicated a ‘restricted’ variety of studies, so we do not but know the way widespread this drawback is. Microsoft does make clear that it is just at the moment occurring to bodily units and hasn’t been noticed on digital machines. The problem is being investigated and appears to solely impression these with the 26200.7623 and 26100.7623 Home windows builds, or later.
You possibly can test in case your PC might be affected by going to ‘Settings’, then ‘About’ and scrolling all the way down to ‘Home windows information’. The ‘OS construct’ part ought to inform you which construct you are on. Naturally, if you happen to aren’t but on the KB5074109 Home windows replace, I would advise holding off till Microsoft can diagnose the issue.
If, nonetheless, you’ve gotten the replace and have discovered your self affected, you’ll have to use the Home windows Restoration choice or, worst-case state of affairs, undergo a clear reinstall. The one factor worse than utilizing Home windows is putting in Home windows, however for informal customers, there aren’t many OSes to select from. I have been listening to Linux calling my title just like the Inexperienced Goblin helmet for a while, and possibly 2026 is the 12 months to lastly placed on the masks.
Finest PC construct 2026
