Microsoft’s January 2026 Windows 11 security update KB5074109 is now being linked to a more serious issue than crashes and app errors: some PCs are failing to boot entirely with a ...

Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors after installing the January 2026 Patch Tuesday security updates. The issue ...

Microsoft says it has resolved a Windows 11 bug that caused some commercial systems to fail to boot with an "UNMOUNTABLE_BOOT_VOLUME" error after installing recent ...

A fresh wave of Windows 11 update trouble is making the rounds, and this one is about as disruptive as it gets: some PCs reportedly can’t boot after installing the latest January 2026 security update.

January update triggered UNMOUNTABLE_BOOT_VOLUME BSODs, leaving some Windows 11 PCs unable to boot. A failed December update rollback left devices in an improper state, and January's patch worsened it ...

Anyone who had been hoping that 2026 would be a better year in terms of Microsoft releasing reliable updates for Windows 11 will have been disappointed. We have already seen numerous issues being ...

greetings. JUST recieved a new dell about a week ago and it has worked great since I got it. it was accidentily unplugged while it was on and now when i re-boot it says: unmountable_boot_volume. I ...

I've got an interesting problem... my laptop (running XP SP3) is giving me a BSOD while it's booting. The pertinent information from the BSO UNMOUNTABLE_BOOT_VOLUME, STOP 0x000000ED (0x86F35900, ...

Q. My Windows XP computer won’t start up and gives me an “unmountable boot volume” message. Can this be fixed or is the hard drive shot? A. The “unmountable boot volume” message typically has three ...