How to fix unhandled Kmode exceptions on Windows 11

BSOD error messages such as KMODE_EXCEPTION_NOT_HANDLED are difficult to diagnose. This error is usually caused by corrupted drivers or memory-related conflicts between applications.

Fixing the error is usually simple, but may require additional troubleshooting steps depending on the system you have. To help you, here are what you need to do to fix Kmode Exception Not Handled BSOD on Windows 11.

Disable Fast Startup

The Fast Startup feature introduced in Windows 8.1 is a hybrid power mode that combines the properties of hibernation mode and shutdown. When you shut down your PC, it saves some of your PC's system files into a hibernation file.

Windows uses the file saved in the hibernation file created after enabling Fast Startup when starting the PC.

Fast boot option may cause KMODE_EXCEPTION_NOT_HANDLED BSOD error. You can disable it by doing the following:

1. Click the Start button or press the Windows keyto open the Start menu.
2. Type CPL, scroll down the options on the right, and click Power Options.
3. When Power Options in Control Panel starts, click the Select what the power button does link in the left panel .
4. Now, click on the Change settings that are currently unavailable link at the top.
5. Under the Turn off settings section, uncheck the Turn on fast startup (recommended) option and click at the bottom to save changes button.

With Fast Startup disabled, restart Windows 11 to see if you still see the error.

Clean Boot Windows 11

Another option to try is to clean boot Windows 11. A clean boot loads your PC with only a minimum of drivers, services, and applications. This can help you determine if there is a driver issue or conflict behind the BSOD message.

Note: This assumes your Windows PC is still running. If not, you may want to try restarting Windows in Safe Mode.

To clean boot Windows 11, use the following steps:

1. Open the Start Menu and search for msconfig.
2. In the "System Configuration" window, click the "Services " tab.
3. Check Hide all Microsoft services and click the Disable all button.
4. Next, click the Launch tab, then click the Open Task Manager link.
5. When Task Manager opens, select the Startup tab and disable all startup applications.
6. Exit Task Manager, click Apply, and then click OK in the System Configuration window.
7. Now it will prompt you to restart your PC - click the Restart button.

After restarting, the error should no longer appear. Note that you'll need to go back and re-enable one app or service at a time to find the item causing the problem.

Check your RAM integrity

If you are still receiving Kmode Exception Not Handled BSOD on Windows 11, you may need to run RAM diagnostics. Windows has a built-in utility called Windows Memory Diagnostic that you can run to check if your RAM is working properly.

To run diagnostics to check your system's RAM, do the following:

1. Use the keyboard shortcut Windows key RStart "Run" Dialog box.
2. Type MdSched and click OK or press Enter.
3. When the Windows Memory Diagnostic tool opens, click the Restart now and check for problems (recommended) option.
4. When your PC restarts, this utility will scan your system memory for problems.

Whether or not the Windows Memory Diagnostic utility finds an error, you can run a second scan using the free open source RAM testing tool memtest86.

Update your network and other drivers

Another common cause of errors is outdated network drivers. Fortunately, updating drivers is simple by doing the following:

1. Click the keyboard shortcutWindows key R.
2. Type devmgmt.msc and click OK.
3. When Device Manager opens, expand the Network Adapters section, right-click the adapter, and select Update Driver.
4. Follow the on-screen wizard to let Windows check for new drivers, or install updated drivers downloaded from the manufacturer's website.

Also, scroll through other devices and if you notice a red or yellow alert notification next to it, you need to update the driver for that device as well.

Free up drive space

If your drive exceeds the limit and becomes full, it may cause system problems, including the KMODE_EXCEPTION_NOT_HANDLED error.

You can easily clean up drive space on Windows 11 through the Settings and Cleanup Suggestions feature. Use the following steps to do this:

1. Click Start > Settings > System > Storage and scroll down to the Storage Management section.
2. Select the Cleaning Suggestions option.
3. Now, expand each section including Temporary files, Large or unused files, Files synced to the cloud and Unused applications. Identify the items you want to remove from each section and click the Clean button.
4. It's also worth noting that you can reclaim more space from the "Temporary Files" section - click "View Advanced Options" .
5. There you will find more temporary system files that can be safely deleted. You'll also notice that more space can be reclaimed (10 GB in this case) - click Delete File.

Check for malware

Windows 11 includes a Windows Security app that scans for viruses and other malware in real time. However, it may not catch everything, and stubborn malware may cause errors.

To scan your PC for malware, use the following steps:

1. Open the Start menu, enter windows security, Then click on the top result.
2. Click Virus & Threat Protection on the left, then click the Quick Scan button on the right.
3. If the basic scan doesn't detect anything, you can use a more in-depth system scan. Click the Scan Options link and select Full Scan or Microsoft Defender Offline Scan.

Deeper scans take longer, but are worth it if entrenched malware is causing the BSOD. Regardless of whether Windows Security Center detects malicious code, try a virus scan with another free and trusted security suite such as Avast or AVG AntiVirus.

It is also important to note that antivirus software may cause errors by incorrectly quarantining essential system files. For example, if you're using Microsoft's built-in security suite, read how to disable or enable Windows security in Windows 11.

If you are using a third-party security suite, read its support page for instructions on temporarily disabling it.

Fix Unhandled Kmode Exception on Windows 11

While the above steps should fix the BSOD error, you can also use other basic actions. For example, shut down the computer completely. Remove external peripherals, including external drives, mice, keyboards, printers, or game controllers, and power the PC.

If that works, plug in one device at a time and reboot until you find the problematic device. You'll then need to update the driver for the external device, replace the power cord, or replace the device itself.

Also, it should go without saying, but make sure Windows 11 is up to date. Typically, Windows updates include bug fixes and updated device drivers that resolve errors. Be sure to check out our tutorial on how to update Windows 11 manually.

If none of the above fixes work, you need to reset your PC. However, before doing so, make sure to take a complete system backup so that you can use the system image to restore your PC.

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