by Gabriel E. Hall - -



Hello, all. I can’t find any information regarding SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (bthhfenum.sys) BSOD. I’ve encountered it twice today when disconnecting my headset and Bluetooth speaker. My PC Dell Inspiron 15 5558 running Windows 10 1607.

Solved Answer

Quite a few Windows 10 users encountered a Blue Screen of Death, which indicates the Bthhfenum.sys file as a culprit. This file is associated with the Windows 10 Consumer Preview ISO images and is a crucial part of Windows Operating System. While bthhfenum.sys BSOD prevailed on Windows 8, apparently it has been inherited by Windows 10. The Bthhfenum.sys error usually signifies SYSTEM_THREAD_EXCEPTION_NOT_HANDLED, but sometimes it may occur IRQL_NOT_LESS_EQUALKMODE_EXCEPTION_NOT_HANDLED or PAGE_FAULT_IN_NONPAGED_AREA characterizations.

Do not remove the Bthhfenum.sys file

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People may often find recommendations to delete .sys files if they trigger BSOD. However, such recommendations are NOT correct because .sys files, in general, cannot be moved, modified or deleted. They are critical system files that constitute the Windows install and enable internal PC hardware or attached hardware, such as a printer, headset, keyboard, etc. to communicate with third-party software. Therefore, by removing Bthhfenum.sys, you may damage system’s integrity and trigger fatal system errors.

Most likely that the culprit of the SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (bthhfenum.sys) BSOD is outdated or corrupted device driver files. However, sometimes BSOD are triggered by malware, so if the bthhfenum.sys error showed up out of nowhere, we would strongly recommend running a scan with Reimage.


Reinstall Drivers

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If you have encountered SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (bthhfenum.sys) error while plugging or unplugging the Headset and Bluetooth speaker, we would recommend addressing the problem to the update/reinstall of Realtek High Definition Audio and Bluetooth module drivers.

  • Right-click Windows key and select Device Manager.
  • Expand the Audio inputs and outputs section. You should see the Microphone and Speakers device drivers.
  • Right-click on each of them and select Uninstall.
  • Then reboot the system.
  • Re-open Device Manager as explained above and click Actions tab at the top of the screen.
  • Select Scan for Hardware changes.
  • When the scan results are ready, click Install driver. The system should detect the latest Realtek High Definition Audio drivers compatible with your OS and install them.
  • Repeat the same steps with the Bluetooth module drivers.

If the BSOD emerged under other circumstances, for example, when trying to launch a game, you may need to update/reinstall NVIDIA Graphics driver. In general, we would recommend opening Device Manager and checking all the device sections. If you see a yellw triangle marked with an exclamation mark, it means that the corresponding driver is malfunctioning and requires maintenance. 

Use System Restore Point

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If your Headset and Bluetooth speaker worked fine before, you can enable a System Restore Point. However, to enable it, you have to have one created before the mergence of the SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (bthhfenum.sys) BSOD. If you have it, then follow these steps:

  • Hold power button to turn off your PC and then restart the system.
  • Before Windows logo shows up, press F8 to boot into Safe Mode.
  • Log in to your account if required.
  • Once the system boots up, disable your antivirus.
  • Click Win key and type system restore.
  • Select Create a restore point, select System Restore and hit Next.
  • Select the latest system restore point and click Next.

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About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate computer expert

Gabriel E. Hall is an expert troubleshooter who has been working in the information technology industry for years.

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