Microsoft investigates Windows 11 boot failures after January updates

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

KB5074109 Update Causes Boot Failures on Windows 11 Devices

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

Microsoft suspects some PCs might not boot after Windows 11 January 2026 Update (KB5074109)

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

Windows PCs ‘Suddenly’ Fail After Microsoft’s New Update: What You Need to Know

According to reports from Microsoft and Windows Latest, the latest update, identified as KB5074109, has caused some Windows devices to fail to boot entirely. Users encountering this problem will see a ...

Windows 11 Patch Tuesday horrors continue as some PCs now cannot boot

The January 2026 Patch Tuesday keeps on giving users headaches, as some affected systems now cannot boot with an "UNMOUNTABLE ...

Windows PCs ‘Suddenly’ Fail After Microsoft’s New Update

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

Windows 11 update may stop some PCs from booting, warns Microsoft

Microsoft has posted an online bulletin confirming that the company is investigating reports that state Windows 11's latest ...