The KMODE Exception Not Handled error in Windows 11 occurs when a kernel-mode program executes an invalid operation, causing the system to crash with a Blue Screen of Death (BSOD). Typically, this indicates issues with drivers, system files, or hardware components such as RAM or storage drives. Resolving this error involves systematically troubleshooting software and hardware components to pinpoint and fix the underlying cause.

Method 1: Disable Fast Startup

Step 1: Fast Startup can sometimes cause kernel-mode errors by preloading faulty drivers. To disable it, first open the Control Panel by typing Control Panel in the Start menu search, and selecting it from the results.

Step 2: Navigate to System and Security > Power Options.

Step 3: Click on Choose what the power buttons do from the sidebar.

Step 4: Click Change settings that are currently unavailable.

Step 5: Under Shutdown settings, uncheck the box labeled Turn on fast startup (recommended). Click Save changes, then restart your computer.

Method 2: Update or Roll Back Problematic Drivers

Step 1: Faulty or outdated drivers commonly trigger this error. To update or roll back drivers, right-click the Start button and select Device Manager.

Step 2: Look for devices with a yellow exclamation mark, indicating driver issues. Right-click the problematic device and select Update driver.

Step 3: Choose Search automatically for drivers and follow the prompts.

Step 4: If updating doesn’t help, right-click the device again, select Properties.

Step 5: Navigate to the Driver tab, and click Roll Back Driver if the option is available. Restart your system afterwards.

Method 3: Uninstall and Reinstall Graphics Drivers

Step 1: Graphics drivers are often culprits in recurring BSOD loops. Open Device Manager again, expand Display adapters, right-click your graphics card, and select Uninstall device. Check the option Attempt to remove the driver for this device and click Uninstall.

Step 2: Restart your computer. After rebooting, open Settings (Win + I), go to Windows Update, then Advanced options.

Step 3: Click on Optional updates on the next page.

Step 4: Under Driver updates, select your graphics driver, and click Download & install. Restart again after installation completes.

Method 4: Run System File Checker and DISM Tool

Step 1: Corrupted system files can trigger kernel-mode exceptions. Open Terminal as administrator by typing Terminal in the Start menu, right-clicking it, and selecting Run as administrator.

Step 2: Enter the following command to repair system image issues:

DISM /Online /Cleanup-Image /RestoreHealth

Step 3: After the DISM scan completes, run the System File Checker with:

sfc /scannow

Step 4: Restart your computer after both scans finish.

Method 5: Test Your RAM for Issues

Step 1: Faulty RAM modules frequently cause kernel-mode errors. Open the Windows Memory Diagnostic tool by typing Windows Memory Diagnostic in the Start menu search bar.

Step 2: Select Restart now and check for problems. Your computer will reboot and automatically run the memory test. If errors are found, replace the faulty RAM modules.

Method 6: Perform a Clean Boot

Step 1: A clean boot helps identify software conflicts. Press Win + R, type msconfig, and press Enter.

Step 2: In the System Configuration window, select Selective startup, then navigate to the Services tab. Check Hide all Microsoft services and click Disable all.

Step 3: Next, open the Startup tab and click Open Task Manager.

Step 4: Disable all startup items by right-clicking and selecting "Disable".

Step 5: Close the Task Manager and restart your computer. If the error stops occurring, re-enable services and startup items one at a time to identify the problematic software.

Method 7: Reset Your Windows 11 PC

Step 1: If previous methods fail, resetting Windows may resolve persistent issues. Open Settings, navigate to System > Recovery.

Step 2: Select Reset PC.

Step 3: Choose to either Keep my files or Remove everything. Select Cloud download to ensure a fresh Windows installation, then follow the prompts to complete the reset.

These solutions should effectively resolve the KMODE Exception Not Handled error on Windows 11. Regularly updating drivers and performing system maintenance will help prevent future occurrences.