System Thread Exception Not Handled

How to Fix “System Thread Exception Not Handled” Error on Windows 10

If you click the power button on your computer tower or desktop, the PC will normally be turned on and loaded faultlessly. Regrettably, a blue screen will be faced instead of Windows 10, who are either unfamiliar with the drivers or do not know how to upgrade the drivers. This blue screen will show up right after you boot your computer, or it can take ten to 15 seconds for the computer to run into the “system_thread_exception_not_handled” error that triggers the famous blue screen.

The error “system_thread_exception_not_handled” is usually found on the boot-up and will lock the computer in a reset process, stopping the computer from being used in any way. We will discuss and explain five ways to correct the code in this article.

What does the “System Thread Exception Not Handled” error mean?

The “system thread exception not handled” error means that a system thread has created an exception in your machine for an error that the handler has not caught. Since the mistake was not captured or fixed, a blue death screen occurred, which led to the PC attempting to gather error data. The following numbers are sometimes used with this stop code: 0x0000007E, 0x1000007E, or unless you are fortunate, the name of the file which triggers the error is atikmdag.sys, nvlddmkm.sys, igdkmd64.sys, etc. Sadly, the system is almost always rebooted for this particular error, forcing you to use safe mode.

What Causes this Error?

The “system thread exception not handled” error happens mainly when you boot or restart the system. It can occasionally occur when the user runs a program that needs some graphical drivers to function. This error occurs when incompatible drivers (most often graphical drivers) are mounted on the device, either out of date, obsolete, or ambiguous.

Graphical drivers can be malware-controlled and inappropriately installed, which is another explanation why the “system thread exception not handled” error occurs in Windows 10.

File Name

If you are fortunate, the error code “system thread exception not handled” will be added to a file name showing which graphical driver triggers the problem. You can fix the error entirely by modifying or restoring this graphical driver. This BSOD error is followed by the popular file names below.

  • Nvlddmkm.sys – This is a graphic driver connected to your Nvidia video card for your Nvidia Windows kernel driver. When a graphics card with Nvidia is installed, it means the card drivers are either obsolete or wrongly installed.
  • Dxgmms2.sys – This is connected to the DirectX drivers you installed.
  • Atikmdag.sys – This graphics driver comes from the family ATI Radeon connected to your ATI video card. If the AMD is installed, it means that this card’s drivers are outdated or installed improperly.
  • Bcmwl63a.sys – It’s for Network Adapter Broadcom 802.11. This connector includes a Broadcom Corporation-designed wireless driver. You can get the “system thread exception not handled” error if configured inappropriately or obsolete.
  • Ntfs.sys – This is for the Windows NT Server.
  • CMUDA.sys – This driver is attached to the USB audio device.

If some of the above-mentioned details show up when the error occurs, it means that you have to reinstall or upgrade the driver. If you have an error code added to a different device file, you may need to look at the driver file name online to learn which driver is having an issue. If there is no system log, all main controls in your device, including network, LAN, Wireless, Sound, Audio, and display drivers, need to be updated (graphics).

How to Boot Into Safe Mode on Windows 10?

Booting into safe mode will allow you to break the reboot cycle in which you are eventually trapped. Since you might not reach your settings, we will help you boot into Windows Recovery Environment (winRE) before using safe mode.

  1. Press and hold the power button for at least 10 seconds to turn off your system. When turned off, press the power button again to turn it back on. 
  2. When turned on, press and hold the power button for at least 10 seconds to turn it off again. Press the power button again to turn it back on. 
  3. Repeat the process until you enter winRE

You can use the “Troubleshoot” option in the list to safely get from winRE mode. Then choose “Startup Settings,” “Advanced Options,” and “Restart.” You will receive a list of options after your computer is restarted. You can press F5 for Networking Safe Mode.

Methods for Fixing “System Thread Exception Not Handled” on Windows 10 Systems

Identify Faulty Driver

  1. Press Win Key + R to open the Run command box
  2. Type eventvwr into the Run command box and press Enter
  3. Look for Windows Logo and click on it
  4. Select System from the drop-down menu
  5. Find the “system_thread_exception_not_handled” error and see which driver is causing it

Update or Reinstall Drivers

The simplest way to patch incompatible drivers is to uninstall them, roll them back to the previous version, or reinstall them if you have the new version. To do so, you need to either type “device manager” into your computer search or press the Windows + X key and pick “device manager” to open your device manager.

  1. To update, you must go into your computer list and right-click on every hardware that has a driver that chooses to update. This covers the drives, audio devices, network adaptors, sound systems, and adaptors for displays. You will automatically check for the current updated version when you click on “update driver.”
  2. To roll back the drivers, press on any piece of hardware with the driver to go through your list of devices and select “properties.” You want to browse the “driver” tab and press on “rollback.” 
  3. To reinstall the driver, you need to disable the device first to reinstall a driver. You will then have to link to the device manufacturer’s website, select your device, and download and update the new driver manually.

Rename the Driver

You can rename the driver, and Windows will fetch a new copy of it and reinstall it if you have a file name associated with the error code “system thread exception not handled.” You must know the driver’s hard drive for this.

  1. Press Win Key + R to open the Run command box
  2. Type cmd in the Run command box and press Enter to open a command prompt.
  3. Type the following in the command prompt box, C: (hit enter) cd windows\system32\drivers (hit enter) ren FILENAME.sys FILENAME.old (replace filename here with the faulty driver file listed with the error code).
  4. Now type exit and restart your system.

Repair System Files

You can restore system files that damage your computer drivers by running Windows repair programs, SFC and DISM if you find you have infected system files.

  1. Open as an administrator the command prompt to run SFC. If you are in safe mode, the “Advanced options” option in the list will be seen.
  2. Type in SFC/scannow and press Enter to replace damaged, lost, or changed system files.

You should run DISM to recover your computer’s safety if this problem persists after running SFC.

Type the following command in the command prompt (one by one)

  • Exe /Online /Cleanup-image /Scanhealth
  • Exe /Online /Cleanup-image /Restorehealth

Restore PC to the Older Version

If you have made your system backups, you can recover it to an earlier period of time where you did not get the error code “system thread exception not handled” However, to do this, you would need either a system repair disc for Windows or a recovery drive

  1. Insert the system repair disc and pick your preferred language.
  2. Click on the repair option and Select troubleshoot, advanced options.
  3. Select system restore and follow the steps given.

Although, most of the time, this issue is resolved by updating, uninstalling, or reinstalling the drivers, however; if the issue persists even after applying the methods above, a clean reinstallation of the operating system is recommended. If you wipe the operating system and reinstall it completely, you can reset the factory configurations and upgrade the basic drivers to their newest models.

How to Fix “System Thread Exception Not Handled” Error – Video Guide

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Raheel is a passionate tech blogger writing in the tech industry for the last 8 years; He is working as a senior technical writer at Reviewsed.