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The CMUSBDAC.sys error is a System error that arises when your system fails to operate the command safely. It flashes an error message “SYSTEM_THREAD_EXCEPTION_NOT_HANDLED” and shows a blue screen of death as well. CMUSBDAC is an audio driver used to manage communication between USB audio devices like microphones and the system’s OS.

It appears when your drivers get corrupted or malfunctioned or it may be infected by spyware, viruses, or harmful malware.

Source:- How to Fix CMUSBDAC.sys Blue Screen of Death in Windows 10

Blue Screen Error CMUSBDAC.SYS

The Blue Screen Error is related to the failure of the communication with your audio devices and OS. When your OS fails to proceed further with the USB devices, then it reflects the error message.

It could be due to an infected USB audio device or corrupted RAM. It occurs mainly while upgrading the firmware, and the primary reason for this may be corrupted update tools and components.

Performing Antivirus Software Scan 

CMUSBDAC.sys Blue Screen appears due to the malfunctioning OS  and existing viruses and malware in your drives. To remove the virus from your USB drive, you have to perform a full system scan of your antivirus. To scan your antivirus, you may use any of the scanning software like Defender Firewall to do a deep system scan.

Updating C-Media USB Device Audio Class Driver Through the Device Manager

Follow these mentioned steps to upgrade the C-Media driver by using the Device Manager:

• First of all, tap Window + X keys simultaneously to launch the Windows Tools options.
• Now, click the “Device Manager” to select it. It is usually located inside the menu list.
• Then, open a node containing audio, video, and game controllers in order to expand the driver.
• If you don’t find it there, go to the “Audio Inputs and Output” section.
• After that, tap the right-click mouse button on the driver.
• Now, hit the “Update Driver Software” option there.
• Next, navigate to the following window and then choose the option “Search automatically for updated driver software.” After that, your Windows will search for it.
• Then, install the recent and updated version of the driver on your PC.
• Finally, restart the system by rebooting it.

In case the Windows informs you that your existing driver is already up-to-date, then you have to search for the available latest edition update for your driver. For this, follow these steps:

• Firstly, you have to navigate to the product manufacturer’s webpage.
• Then check it if there is a recent version of the driver that is available or not.
• If found, then hit the latest update for your driver, which seems compatible with your system.
• After that, place it in a convenient and appropriate place.
• Now, go back to the “Device Manager.”
• After that, click the option “Update Driver Software” and then choose the browse option. It will be located in the upcoming window.
• Next, locate your unzipped and installed file.
• Then, tap the install tab to install the driver update.
• Finally, perform a soft reboot to proceed and save the changes that you have made to your PC.

Reinstalling and Installing Driver

• First of all, tap the Windows + X keys together to launch the Windows Tools page.
• Then choose the option “Device Manager” available in the menu list on your screen.
• After that, open the node which packs with various options like a game manager, video, and audio to open the driver.
• Next, tap right click on the particular driver option and then tap on Uninstall.
• After that, reboot your system here.
• Next, go back to the “Device Manager” option.
• Now, hit the action button located at the upper portion of your screen.
• Then, choose the option “Scan for hardware changes.”
• When the driver appears in the result, hit the install option there.
• Wait for a while to install the updated recent edition of your driver.

In case the method becomes unsuccessful, then install it manually.

Performing System Restore via Safe Mode

In case, you wish to apply the system restore method to troubleshoot this issue; then you have to follow these steps:

• First of all, open the “Settings” app on your PC. Alternatively, you can use the Window key to expand the start menu and then from the available applications and hit the “Settings” there.
• Then tap on the “Update and Security” option.
• After that, navigate to the “Recovery.”
• Next, launch the option “Open Recovery Settings.”
• Now, go to the “Advanced startup” option and hit the “Restart” tab there. Now, the PC will reboot under the Windows Recovery mode.
• After that, navigate to the options window and hit the “Troubleshoot” option there.
• Then, hit the option “Advanced.”
• Click on the “Startup Settings” tab.
• Now, hit the “Restart” option.
• Finally, hit the 4 numbered key from your keyboard to enable the system to boot under Safe mode.

Turning off Antivirus

If the Safe mode booting method didn’t work, then you can switch off Antivirus programs to fix this issue.

Follow these steps to switch off your antivirus programs:

• Firstly, expand the “Control Panel” located inside the Windows Tools menu.
• After that, modify the “View by Mode” to “icon view.”
• Then, click on “Recovery.”
• After that, hit the option “Open System Restore.”
• Now, you have to press the “Next” located in the upcoming window.
• Next, various options will display on your system, and you have to choose a restore point option, which says that this issue created before CMUSBDAC.sys error commenced to happening.
• After that, hit the “Next” tab.
• Finally. Click on “Finish.”

Fixing Issue by Troubleshooting the Problematic Driver

Follow these steps if you wish to detect the “minidump” file located on your system:

• First of all, launch the “Windows Explorer” present on the taskbar of your system.
• After that, locate “This PC” icon at the left-hand side panel, then tap right-click it.
• Now, hit the “Properties” option.
• Then, tap on the “Advanced” settings link located at the left-hand side panel.
• Now, hit the “Settings” tab. It is situated inside the “Startup and Recovery” segment under the “System Properties.”
• Next, mark both the checkboxes regarding the system log, and the other one is an automatic restart. It is located under the “System failure” panel.
• After that, expand the dubbing info menu listing.
• Then choose the “Small memory dump” option there.
• Finally, hit the “OK” tab to proceed if you have completed all the procedures.

Chloe Decker is a self-professed security expert; she has been making the people aware of the security threats. Her passion is to write about Cybersecurity, cryptography, malware, social engineering, internet, and new media. She writes for Microsoft products at office.com/setup.