The Windows 11 KB5074109 January 2026 security update is going from bad to worse. After Microsoft effectively told affected users it was safe to uninstall the update due to black screens, app crashes, and Outlook freezes, some people are now finding that the rollback itself fails with error 0x800f0905.

KB5074109 rollback fails with error 0x800f0905

According to a new report from Windows Central, Windows 11 systems that try to remove KB5074109 are hitting 0x800f0905, a servicing stack/component store error that blocks the uninstall process entirely. That leaves users stuck between keeping a buggy update that breaks apps and sleep mode, or attempting more drastic repairs.

Workarounds users are trying while Microsoft hasn’t shipped a fix

Microsoft has not yet released a dedicated fix for the uninstall failure. Still, experts and support articles are recommending a few workarounds: using a System Restore point (if one exists from before the update), running the “Fix problems using Windows Update” repair install that keeps apps and files, and then trying the uninstall again. All of these options come with the usual warnings to make a full backup first.

Other KB5074109 issues are still being reported

Meanwhile, reports of issues related to KB5074109 continue to grow. Users on older hardware say the update is breaking S3 sleep mode, causing machines to blank the screen but never actually enter low-power sleep, often requiring a hard reboot. Others continue to hit 0x803F8001 app launch errors, and Outlook Classic hangs, especially when mail archives live in OneDrive or other cloud folders.

For affected Windows 11 users

For now, the situation is messy: Microsoft still lists KB5074109 as the current Windows 11 January 2026 security update and acknowledges multiple regressions, suggests uninstalling it if you’re badly affected… but some users can’t even roll back cleanly without running into yet another error. If your PC runs fine, just sit tight for a fix.

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I’m a tech editor and journalist with over 20 years of experience covering everything from cutting-edge smartphones and AI breakthroughs to gaming hardware and future-forward tech. I have a passion for making complex technology accessible, relatable, and genuinely interesting—especially when it’s something that impacts how we live, work, or play.

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