CMUDA.sys is a Windows operating system driver file that is associated with the USB Device Audio capabilities of a computer. This file is known at times, to cause a Blue Screen error. But the main reasons include conflicts like RAM or Hard Disk Issues, incompatible firmware, corrupt drivers or malware infection, etc. Fixing this issue is straightforward. However, there are various potential workarounds for the same.


This driver file usually caused the SYSTEM_THREAD_EXCEPTION_NOT_HANDLED error, but there can be others Stop Error associated with it as well – like the following ones:


If this error just started to occur and you have a System Restore Point created already, you can use it to revert it back to your earlier settings and configuration.

Eles, you can see if our following suggestions help you:

  1. Fix the Sound, video and game controllers drivers.
  2. Run online Windows 10 Blue Screen Troubleshooter.

1] Fix the Sound, video and game controllers drivers

After booting into the Safe Mode, open Device Manager.

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The main drivers that might be a cause for this particular file will be marked with a small yellow exclamation mark icon inside of the Device Manager. If not, look out for sub-entries under Sound, video and game controllers entry such as C-Media USB Audio Class driver. 

You need to either update or rollback the driver. If you just updated any of these drivers, and the issue started after that you need to rollback the driver. If you did not, then maybe updating this device driver to its latest version will help.

Alternatively, you can Uninstall them and then go to your audio card manufacturer’s website and get the latest drivers and install them accordingly. You can download the C-Media USB Device Audio Class Driver from

2] Run online Windows 10 Blue Screen Troubleshooter

Run the online Windows 10 Blue Screen Troubleshooter from Microsoft is a wizard that is meant to help novice users fix their Stop Errors. It will help you fix SYSTEM THREAD EXCEPTION NOT HANDLED error and offers helpful links along the way.

All the best!

Posted by on , in Category Windows with Tags
Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.

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