How to Fix Kmode_exception_not_handled Error in Windows 11

The KMODE_EXCEPTION_NOT_HANDLED error is a common Blue Screen of Death (BSOD) issue that Windows 11 users may encounter unexpectedly. This error typically indicates that a kernel-mode program generated an exception that the error handler couldn't catch, often caused by driver conflicts, hardware failures, or corrupted system files. If you're facing this frustrating problem, don't worry—there are several effective methods to troubleshoot and resolve the issue. In this guide, we'll walk you through step-by-step solutions to fix the Kmode_exception_not_handled error in Windows 11 and get your system back to normal.

How to Fix Kmode_exception_not_handled Error in Windows 11

1. Restart Your Computer in Safe Mode

Before attempting more complex fixes, it's essential to boot into Safe Mode. Safe Mode starts Windows with a minimal set of drivers and services, making it easier to identify and fix issues caused by third-party software or drivers.

• Press Windows key + R to open the Run dialog box.
• Type msconfig and press Enter.
• Navigate to the Boot tab and check the Safe boot option.
• Click OK and restart your PC.
• Once in Safe Mode, observe if the error persists.

If the error does not occur in Safe Mode, it's likely caused by third-party software or drivers. You can then proceed to disable or uninstall problematic software.

2. Update or Roll Back Drivers

Outdated or incompatible drivers are a common cause of the KMODE_EXCEPTION_NOT_HANDLED error. Updating your drivers to the latest version can resolve compatibility issues, while rolling back recent updates can fix problems caused by recent driver changes.

To Update Drivers:

• Open Device Manager by right-clicking the Start menu and selecting it.
• Locate the device category related to the error, such as Display adapters, Network adapters, or Storage controllers.
• Right-click on the device and select Update driver.
• Choose Search automatically for updated driver software.
• Follow the prompts to install updates if available.

To Roll Back Drivers:

• In Device Manager, right-click the device causing issues.
• Select Properties, then go to the Driver tab.
• Click on Roll Back Driver if the option is available.
• Follow the instructions to revert to the previous driver version.

After updating or rolling back drivers, restart your computer and check if the BSOD issue persists.

3. Run System File Checker and DISM Tool

Corrupted system files can cause various errors, including KMODE_EXCEPTION_NOT_HANDLED. Running built-in Windows repair tools can restore corrupted files and fix system stability issues.

Run System File Checker (SFC):

• Open Command Prompt as an administrator. To do this, right-click the Start menu and select Windows Terminal (Admin) or Command Prompt (Admin).
• Type sfc /scannow and press Enter.
• Wait for the scan to complete. If issues are found, Windows will attempt to repair them automatically.

Run Deployment Image Servicing and Management (DISM):

• In the same administrator Command Prompt, type the following command and press Enter:
• DISM /Online /Cleanup-Image /RestoreHealth
• Allow the process to complete. This may take several minutes.

After completing these steps, restart your PC and see if the error is resolved.

4. Check for Windows Updates

Microsoft regularly releases updates that include bug fixes, security patches, and driver updates. Ensuring your Windows 11 is up to date can help prevent and fix BSOD errors.

• Open Settings by pressing Windows key + I.
• Navigate to Windows Update.
• Click Check for updates.
• If updates are available, download and install them.
• Restart your PC after the updates are installed.

Keeping your system updated minimizes the risk of encountering known bugs and driver incompatibilities that could lead to the Kmode_exception_not_handled error.

5. Perform a Clean Boot to Identify Conflicting Software

Sometimes, third-party applications or startup programs conflict with Windows processes, causing BSOD errors. Performing a clean boot helps identify problematic software.

• Press Windows key + R, type msconfig, and press Enter.
• Go to the Services tab, check Hide all Microsoft services, then click Disable all.
• Switch to the Startup tab and click Open Task Manager.
• In Task Manager, disable all startup items.
• Close Task Manager and click OK in the System Configuration window.
• Restart your computer and check if the error persists.

If the BSOD does not occur after a clean boot, gradually enable services and startup items to identify the culprit.

6. Check Hardware Components and Run Diagnostics

Faulty hardware, especially RAM or storage devices, can trigger kernel errors like KMODE_EXCEPTION_NOT_HANDLED. Running hardware diagnostics can help identify failing components.

Check RAM:

• Press Windows key + R, type mdsched.exe, and press Enter.
• Select Restart now and check for problems.
• Allow the Windows Memory Diagnostic tool to run and report any issues.

Check Storage Devices:

• Open Command Prompt as administrator.
• Type chkdsk /f /r and press Enter. You may need to restart your PC for the scan to run.

If hardware issues are detected, consider replacing the faulty component or seeking professional repair services.

7. Reset Windows 11 as a Last Resort

If none of the above solutions work, resetting Windows 11 to its factory defaults might be necessary. This process reinstalls Windows but gives you the option to keep your files or remove everything.

• Open Settings and navigate to System > Recovery.
• Click Reset PC and select either Keep my files or Remove everything.
• Follow the on-screen instructions to complete the reset.

Note: Back up important data before resetting your system to avoid data loss.

Conclusion: Key Takeaways to Resolve the Kmode_exception_not_handled Error

Encountering the KMODE_EXCEPTION_NOT_HANDLED error in Windows 11 can be disruptive, but with a systematic approach, you can identify and fix the root cause. Begin by booting into Safe Mode to isolate the problem, then proceed to update or rollback drivers, scan system files, and install Windows updates. Checking hardware components and performing clean boots can further pinpoint software conflicts. If hardware issues are suspected, running diagnostics or replacing faulty parts may be necessary. As a last resort, resetting Windows can restore system stability.

Regular maintenance, keeping drivers and Windows updated, and monitoring hardware health can prevent this error from recurring. By following these steps, you'll enhance your Windows 11 experience, ensuring a stable and smooth-running system.