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.

Microsoft is aware of an alleged issue that leaves PCs unable to boot and requires manual recovery after Windows 11 January ...

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

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.

Microsoft is investigating reports of serious boot failures affecting Windows 11 devices following the January 2026 security ...

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 <BR><BR>UNMOUNTABLE_BOOT_VOLUME, STOP 0x000000ED ...

Here's the pitiful story:<P>To install SQL2000 SP2 I tried to unpack the archive after dloading from ms.com. I hear the HD spindown (or shutdown- very odd- and not anything else, just the HD) then ...