Windows 11 update KB5074109 is causing app failures, Outlook hangs, and black screens. If you’re experiencing any issues, here’s how to uninstall the January 2026 update to revert to a known good state.


Windows 11 update KB5074109 is causing app failures, Outlook hangs, and black screens. If you’re experiencing any issues, here’s how to uninstall the January 2026 update to revert to a known good state.