Black screen on login, search box shows letter C

The “Moment 4” update greeted users with a black screen on login — explorer.exe simply refused to start, leaving a blank void where a desktop should be. The search box, in a surreal twist, rendered itself as just the letter “C” in the taskbar. File Explorer became sluggish with excessive memory consumption. AMD driver profiles reset on every reboot. Desktop icons stopped responding to clicks. The update that was supposed to bring exciting new features to Windows 11 instead brought an existential void and a search box that could only express a single letter of the alphabet.