How to fix error 0x000000ef in Windows 11

Solution Steps

1. 1 Restart your PC. Sometimes a temporary glitch can cause this error. If it happens again, continue.
2. 2 Press Windows key + R, type 'cmd', then press Ctrl+Shift+Enter to open Command Prompt as administrator. Type 'sfc /scannow' and press Enter. This scans and repairs system files. After it finishes, type 'DISM /Online /Cleanup-Image /RestoreHealth' and press Enter. These commands fix corrupted system files that might be causing the critical process to die.
3. 3 Press Windows key + I to open Settings, then go to Windows Update. Click 'Check for updates' and install any pending updates. Also, go to Advanced options → Optional updates and install any driver or quality updates. Updates often include fixes for critical processes.
4. 4 Run a full antivirus scan using Windows Security (or your preferred antivirus). Press Windows key + I, go to Privacy & security → Windows Security → Virus & threat protection → Scan options, and select 'Full scan'. Malware can kill critical processes, so this step is crucial.
5. 5 If the error persists, boot into Safe Mode. Press Windows key + R, type 'msconfig', and press Enter. In the Boot tab, check 'Safe boot' with 'Minimal' selected. Restart. In Safe Mode, uninstall recently installed software or drivers. Then open System Configuration and uncheck 'Safe boot' to return to normal mode. Safe Mode loads only essential drivers, helping you isolate the problem.