How to Fix System Thread Exception Not Handled Error?

BSODs (blue screens of death) are among the most frustrating experiences a computer user can experience.

In many cases, the “System Thread Exception Not Handled” error causes BSODs. In Windows 10 and Windows 11, this issue can be triggered by several underlying issues.

Ensure your system runs smoothly by understanding and fixing this error. So, let’s get started with the guide.

What is the “System Thread Exception Not Handled” Error?

System threads generate exceptions that are not caught by error handlers, resulting in the “System Thread Exception Not Handled” error.

In many cases, the error code (e.g., 0x0000007E) or the file name (e.g., nvlddmkm.sys) gives an indication of the problematic driver or component.

Common Causes of the Error

It is possible for “System Thread Exception Not Handled” to occur for a variety of reasons. Here are a few common causes:

1. Outdated or Corrupted Drivers: These errors are often caused by outdated or corrupted drivers. You will experience a BSOD if a driver is not communicating with your hardware.
2. Corrupted System Files: Your operating system’s system files are crucial to its stable operation. There are times when corrupt or missing files can cause system instability and BSODs.
3. Incorrect BIOS Settings: The BIOS can be configured incorrectly, leading to compatibility issues.
4. Hardware Conflicts: Hardware faults, such as faulty RAM, hard drives, or graphics cards, may cause this problem.
5. Incompatible Software: This error can also be caused by incompatible software or recently installed applications.

How to Resolve the “System Thread Exception Not Handled” error?

Here are some fixes that will help you resolve the system thread exception not handled error:

Fix 1: Update, Roll Back, or Reinstall Drivers

It is also required that you enter Windows or Safe Mode to perform this method.

Using it can resolve driver incompatibilities that can cause Windows 11 system thread exceptions not to be handled.

Here’s how to update, uninstall, and reinstall drivers.

1. Press the “Windows + X” keys.
2. From the pop-up menu, select Device Manager.
3. Afterward, right-click on a driver and select Update driver from the context menu.

4. Thereafter, in the pop-up window, select Search Automatically For Driver.
5. Right-click a driver and select Properties.
6. Afterward, go to the Driver tab and click Roll Back Driver.

7. Select a reason and click Yes.
8. If not Fixed, then select the driver and right-click on it. Thereafter, hit the Uninstall Driver option.
9. To install a driver, go to the website of the device manufacturer and follow its instructions.

Fix 2: Run Memory Diagnosis

If a logical memory problem is detected, memory diagnosis will detect and fix it. Here are the steps you need to follow:

1. Start Windows or Safe Mode.
2. Use the “Windows + R” keys to open the run box and type “mdsched.exe.”
3. Once the Windows Memory Diagnostic program has been launched, select “Restart now and check for problems.”

4. Let the computer complete the memory diagnosis. There will usually be a short wait while this process is completed.
5. Finally, you can view the results in Event Viewer.

Fix 3: Update Firmware

It is possible to resolve existing problems and hardware incompatibility concerns by updating the firmware.

There is a potential for it to increase the stability of computers. However, to update your firmware, follow the steps below.

1. At the same time, press the “Windows + R” keys.
2. Using the run box, type “MSConfig” and click OK.
3. Go to the Tools section.
4. Then select System Information and click Launch.

5. It is also a good idea to keep the BIOS version and date handy.
6. You will need to download the correct new BIOS version from the manufacturer’s website.
7. Using the USB, boot into BIOS to upgrade the firmware using the latest BIOS version.

Fix 4: Disable Fast Startup

Windows 11 features a quick startup feature that reduces the operating system’s startup time.

It has been reported that if you disable the rapid startup feature, there will not be a BSOD error related to System Thread Exception Not Handled.

1. Go to the control panel.
2. Search for and select power alternatives.
3. You can select the function of the power buttons.
4. If any settings are currently unavailable, change them.
5. You should uncheck the “enable rapid startup” checkbox. Click OK to save your changes.
6. After that, restart Windows and see if it works. There is no longer a BSOD System Thread Exception Not Handled.

Fix 5: Rename the Faulty File

It is recommended that users rename the file when receiving the file name associated with the thread exception that has not been handled by the system.

This will result in Windows building a new copy of the program and reinstalling it. However, the driver files are located at C:\ Windows\ System32\ drivers.

If the file name associated with a system thread cannot be retrieved, users must rename it. By doing this, Windows creates a new copy and reinstalls it. To rename the file, follow these steps:

1. Open File Explorer and navigate to C: WindowsSystem32drivers.
2. Click on the affected driver and press F2.
3. Rename the file with the old extension.
4. To restart your computer, press Enter.

Fix 6. Repair your system files

The system thread exception not handled error can also occur because of corrupted system files. So repairing them would be a good idea. So go ahead and follow the below steps:

• Press Windows + X and select Windows terminal (Admin). In case you are in Safe mode, then launch CMD from the advanced options list.
• Type down, sfc /scannow, and press enter. This will start replacing any damaged or lost system files.

After running the command, if you encounter any issues, you can try running DISM to restore the health of your PC.

So do run these below commands in Windows Terminal or CMD one by one:

Exe /Online /Cleanup-image /Scanhealth

Exe /Online /Cleanup-image /Restorehealth

Fix 7. Rename the faulty driver

If you find a file named as or associated with the system thread exception not handled error code, then you can rename the driver to something else. This way, Windows will fetch a new copy of the driver and install it.

To rename the driver, follow the below steps:

• Go to Windows search and type down CMD.
• Right-click on it and select Run as administrator -> Yes.
• Type down C: and hit enter.
• Next, paste this path and press enter cd windows\system32\drivers (hit enter) ren FILENAME.sys FILENAME.old. Over here, you have to replace the FILENAME with the faulty driver file name.
• Finally, type down exit press enter, and then restart your PC.

Fix 8. Restore your PC to an earlier version

In case you have ever created a backup of your system. Then you can restore it to an earlier period of time before you get the system thread exception not handled error.

For this, you will need a Windows system repair disc or a recovery drive. If you do have it, follow the below steps:

• First, insert the system repair disc into your computer and select your preferred language.
• Next, click on the Repair option and select Troubleshoot -> Advanced options.
• Next, choose a system restore point and follow all the onscreen instructions.

Fix 9: Reinstall the OS

For Windows 11 system thread exceptions that are not handled and don’t respond to the above methods, you can perform a clean reinstallation of the operating system.

This strategy has been reported to identify system thread exceptions that have not been handled by the user.

To back up or restore data prior to reinstalling the operating system, you should use reliable tools. It is a good idea to start with a clean install of Windows on a new hard drive.

Moreover, as a final step, you can choose to boot from the new System disc by configuring the BIOS startup sequence.

Final Words:

I hope the above steps helped you fix the system thread exception not handling error.

However, if you still get the error, I recommend you reinstall Windows by going to the System -> Recovery option and seeing if that helps you.