How to fix error 0x00000121 in Windows 11

Solution Steps

1. 1 Press Windows key + X and select 'Device Manager'. Look for any devices with a yellow exclamation mark. Right-click them and select 'Update driver'. Choose 'Search automatically for drivers'. This ensures you have the latest, most stable drivers, which often fix violations.
2. 2 Open Event Viewer (Win+R, type 'eventvwr'). Go to Windows Logs → System. Look for errors with source 'BugCheck' or 'Kernel-Power' just before the crash. Note the driver name if mentioned. This helps identify the culprit.
3. 3 Run the System File Checker: Open Command Prompt as admin (Win+X → 'Terminal (Admin)'). Type 'sfc /scannow' and press Enter. This repairs corrupted system files that might be causing driver conflicts.
4. 4 If SFC finds issues, run DISM: Type 'DISM /Online /Cleanup-Image /RestoreHealth' and press Enter. This fixes the system image, which can resolve deeper corruption.
5. 5 Check for overheating: Use a temperature monitoring tool like HWMonitor (download from official site). If your CPU or GPU exceeds 90°C, clean dust from fans and ensure proper ventilation. Overheating can cause drivers to malfunction.
6. 6 If the error persists, perform a clean boot: Press Win+R, type 'msconfig', and press Enter. In the 'Services' tab, check 'Hide all Microsoft services' and click 'Disable all'. Then go to 'Startup' → 'Open Task Manager' and disable all startup items. Restart. If the error stops, gradually enable services to find the culprit.