Last Updated on May 26, 2021
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CMUSBDAC.sys SYSTEM_THREAD_EXCEPTION_NOT_HANDLED is a member of the BSOD error family that has been affecting users for some time. While this bug has been around for a long time, it became more common after installing the cumulative update KB4016635 in Windows 10. This guide explains what this error is and how to deal with it with effective solutions that will allow you to regain full control of your system.
What causes cmusbdac.sys bluescreen error? How to fix cmusbdac.sys crash? In this Windows Bulletin post, you will learn how to fix cmusbdac.sys BSOD.
What causes CMUSBDAC.sys blue screen of death in Windows 10
According to some experts, CMUSBDAC.SYS error may be caused by faulty update components. However, others claim that the main reason why it interrupts users’ work is a virus/malware or a corrupt C-Media USB Audio Class Driver. Unfortunately, the bug continues to cause problems for users all over the world.
The CMUSBDAC.SYS file is actually associated with the C-Media USB Audio Class Driver. The file itself cannot be deleted or modified in any way because it belongs to the Windows I/O subsystem.
How to fix the blue screen of death CMUSBDAC.sys on Windows 10
Restore your system using a restore point
Sometimes when your system has been updated or you have installed new programs on your computer, the new updates may not be compatible with your computer and CMUSBDAC.sys blue screen of death appears.
If you have installed new programs, uninstall them and see if it works. If you’ve updated your system, try running a system restore at the restore point before the blue screen appears.
- Click the “Start” button in the lower-left corner of the screen and type “Restore.” Then click Restore in the list of results.
- Click Open System Restore to open the System Restore Wizard.
- Follow the instructions of the System Restore Wizard to restore your system from a system restore point.
- After system restore, reboot your computer normally and check if the blue screen issue is resolved.
Reinstall the C-Media USB Audio Class driver
Since the CMUSBDAC.sys blue screen error may be due to a problem with the C-Media USB Audio Class Driver, you can uninstall and reinstall the driver to solve the problem.
- Press the Windows logo and R keys on your keyboard simultaneously to bring up the Run dialog box.
- Type devmgmt.msc and click OK.
- Double-click Sound, Video, and Game Controllers to expand the category.
- Right-click on the C-Media USB Audio Class driver and click Uninstall Device.
- Then follow the instructions on the screen to complete the uninstallation.
- Reboot your computer.
- Go to the manufacturer’s website to download and install the C-Media USB Audio Class driver on your computer.
After reinstalling, restart your computer and check to see if the CMUSBDAC.sys blue screen is fixed.
Scan for Viruses and Malware
Blue screen CMUSBDAC.sys can appear if your system is infected with viruses or malware.
- Run a virus scan on your entire Windows system. Yes, it may take some time, but it’s worth it. Unfortunately, Windows Defender may not detect the virus.
- Therefore, it is better to try another antivirus program.
- If malware is detected, follow the instructions of the antivirus program to remove it.
- Then restart your computer as usual and see if this solves the blue screen problem.
Updating available drivers
A missing or outdated device driver can cause CMUSBDAC.sys blue screen of death. To rule out this cause of your problem, you need to update the available device drivers on your computer.
You can manually find the latest version for your device from the manufacturer, download it and install it on your computer. This requires time and computer skills. We recommend doing this if you have good computer skills.
If you don’t have the time or patience, you can also do it automatically with a third-party driver update program. You don’t need to know exactly what system is installed on your computer, you don’t have to risk downloading and installing the wrong driver, and you don’t have to worry about making a mistake during installation.
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Frequently Asked Questions
- Reinstall the C-Media USB Audio Class driver.
- Update existing drivers.
- Check for viruses and malware.
- Restore your system to a restore point.
- Click on the Advanced startup option.
- Click on the Troubleshooting option.
- Click on the Advanced Settings option.
- Click on the Startup Settings option.
- Click on the Restart button.
- Restart or shut down your computer.
- Check your computer for malware and viruses.
- Run the Microsoft Fix IT program.
- Check if the RAM is properly connected to the motherboard.
- Defective hard disk drive.
CMUSBDAC stands for C-Media USB DAC Device Driver. Any small problem with this driver can cause a blue screen of death with the error message SYSTEM_THREAD_EXCEPTION_NOT_HANDLED. The driver may be out of date or damaged.