Windows 11 January 2026 updates may cause boot failures on some PCs. Microsoft is investigating issues linked to KB5074109.

After the first update stopped PCs from shutting down or going to sleep, the latest one halts the boot-up process. Microsoft says it's investigating the problem.

This comes just hours after reports that another emergency update has been issued by Microsoft to affect other problems ...

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

Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors ...

Another week, another big Windows problem.

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

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

In a surprising turn of events, Microsoft has confirmed that its January 2026 security update, KB5074109, is causing significant boot issues for some Windows 11 users. This latest development ...

Windows 11 had a rough 2025. We tracked the top 20 Windows 11 issues reported by Windows Latest, from failed updates to ...

Experiencing a Windows 11 boot loop can be incredibly frustrating, transforming your computer into a seemingly endless cycle of restarts that disrupts productivity. When your system continuously fails ...