How To Fix: System Thread Exception Not Handled Error in Windows 10

How To Fix: System Thread Exception Not Handled Error in Windows 10

System Thread Exception Not Handled Blue Screen of Death (BSOD) is a widespread problem among Windows 8 and Windows 10 users. And could occur anytime while start-up of Windows or while doing any random work. It’s unpredictable when it can occur, but for most users, it usually happens at boot time. So we are mentioning several ways (applicable to Windows 10 users) to fix this issue for users who get BSOD at start-up or when it appears unpredicted. And any of the solutions will NOT require you to have bootable media of Windows 8 or 10 as most users don’t have these by default.

Solution For System Thread Exception Not Handled in Windows 10

Windows 10 has an inbuilt recovery, and if you run into any start-up issue during boot of OS, it’ll show up offering you options to fix your computer. But the question is, how to reach those options. Many people suggest using a Bootable CD or USB for windows, as they help to get users the same tools with convenience, which are already there is an operating system recovery system. So, to get into recovery mode of Windows 8 or 10, do the following steps:


  • When you get BSOD, just close the PC using the power button, press it continuously till it gets switched off.
  • Power ON and OFF it abruptly when the Windows logo appears during the boot process. Repeat this 3-4 times, until windows show you various recovery options.
  • Assuming you reached the Windows 8 or 10 recovery options, go into Troubleshoot > Advanced Options > Command Prompt.
  • Run following command in it:

sfc /scannow /offbootdir=c:\ /offwindir=c:\windows

  • It’ll find some errors but shall not be able to fix all. Also, run the following command then:

bcdedit /set {default} bootmenupolicy legacy

  • Now close the command prompt and reboot the computer.

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Find the Driver Which is Causing You Trouble

  • Install this free application named: WhoCrashed and run this utility to find out which driver is causing you SYSTEM_THREAD_EXCEPTION_NOT_HANDLED BSOD error.
  • The output of the utility should be similar as below:












On Fri 2/6/2015 7:56:50 PM GMT your computer crashed

crash dump file: C:\Windows\Minidump\0206153198401.dmp

This was probably caused by the following module: atikmdag.sys (atikmdag+0xC508B)

Bugcheck code: 0x1000007E (0xFFFFFFFFC0000005, 0xFFFFF801C9BBE08B, 0xFFFFD0015ADEF128, 0xFFFFD0015ADEE930)


file path: C:\Windows\system32\drivers\atikmdag.sys

product: ATI Radeon Family

company: Advanced Micro Devices, Inc.

description: ATI Radeon Kernel Mode Driver

Bug check description: This indicates that a system thread generated an exception which the error handler did not catch.

This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.

A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: atikmdag.sys (ATI Radeon Kernel Mode Driver, Advanced Micro Devices, Inc.).


If you check the file path, it shows that atikmdag.sys is the troublesome driver for me. It can vary for most users.

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Or if you’re not in a condition to run the utility, then do the following steps:

  • Now you need to open the computer in Safe mode. So, as soon as you turn ON the computer, keep pressing the F8 function key along with it, until the OS shows you a menu of boot options.
  • Select Safe Mode and Enter.
  • During the boot or after login, when you get BSOD again, you’ll also find a file name along with System Thread Exception Not Handled. The output would be like System Thread Exception Not Handled (FILENAME.sys) where FILENAME could vary for users.

Following is a list of those filenames along with the associated driver:

Drivers Associated


















atikmdag.sys  AMD Display Graphics Driver


ATI2DVAG.sys  AMD Display Graphics Driver


ATI2CQAG.dll  AMD Display Graphics Driver


ATIVPK.sys  AMD Display Graphics Driver


AMD2DVAG.sys  AMD Display Graphics Driver


AMDKMDAG.sys  AMD Display Graphics Driver


AMDVPK.sys  AMD Display Graphics Driver


iaStorA.sys  Intel Rapid Storage Technology Driver  x64


wificlass.sys  Cisco wireless Access Points

  • Note down the file name somewhere.
  • Reboot and again you to abruptly restart the computer to get into the recovery mode of Windows 8 or 10.
  • Navigate to Troubleshoot > Advanced Options > Command Prompt.
  • Run following commands in the command prompt:




cd windows\system32\drivers



where FILENAME is the one you noted in the above step. Like I had an error because of atikmdag.sys, hence for me the command is:

ren atikmdag.sys atikmdag.old

  • Close command prompt and Reboot.
  • Now your computer should boot successfully.
  • Re-install updated driver who caused you all this trouble or everything is working fine, then leave it. Windows shall automatically take care of it.

Solution 2

In case, you’re not getting success in reaching safe mode, then maybe you can try this way to boot computer successfully:

Turn it off, remove the battery, unplug it from its power source, leave it off a few minutes, hold down the power button for 5-10 seconds, plug power back in BUT NOT THE BATTERY, turn on the laptop. It should start normally. Then put the battery back in at your earliest convenience. Once PC boots successfully, remove that driver, which is causing you trouble and Reboot again.

Solution 3

In case if you get BSOD in an unpredicted manner frequently, then maybe you should try disabling hardware acceleration in browser and flash. Disabling hardware acceleration for every browser would be different.

Disable Hardware Acceleration in Chrome

  • Open Google Chrome.
  • Type in chrome://flags in the address bar and Enter.
  • Scroll down and navigate yourself to “GPU compositing on all pages.”
  • Select “Disabled” from the dropdown. It would be “Default” by default.

  • Click Relaunch Now. Chrome will close and restart.

Disable Hardware Acceleration in Mozilla Firefox

  • Open Mozilla Firefox
  • Type in about:preferences#advanced in the address bar.
  • Uncheck “Use hardware acceleration when available.”

  • Close and Restart Firefox.

Disable Hardware Acceleration in Internet Explorer

  • Open Internet Explorer
  • Click Tools > Internet Options
  • Select “Advanced” and under “Accelerated graphics,” checkbox “Use software rendering instead of GPU rendering.”

  • Apply and OK.
  • Restart Internet Explorer.

Disable Hardware Acceleration of Adobe Flash Player

  • Go to Adobe Flash Help Page.
  • Scroll down to Step 5 that has an animated tree embedded flash object.
  • Right-click on the animation and select “Settings.”

  • The dialog box of Adobe Flash Player Settings would open.
  • Uncheck “Enable Hardware Acceleration.”

  • Close
  • Restart the Browser.
  • Repeat the steps with other installed browsers.

Hopefully, now you should not get the Blue screen of death again on your computer with Windows 10.

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