Windows 11 blocks drivers that aren't digitally signed by Microsoft. The CMI8738 drivers are not. If you see Code 52 in Device Manager, you need to disable this security feature.
How to do it (Temporary – for one boot):
Permanent (Not recommended for security, but works): Run Command Prompt as Administrator and type:
bcdedit /set testsigning on
(This puts a "Test Mode" watermark on your desktop.) Cmi8738 Driver Windows 11 64 Bit
Windows 11 (64-bit) strictly enforces WHQL driver signing and disables unsigned kernel drivers by default (Secure Boot + Driver Signature Enforcement). The last signed CMI8738 drivers were:
The C-Media CMI8738 is a legendary audio chip. It was a staple in the early 2000s, found in countless PCI sound cards and integrated onto motherboards of that era. It is fondly remembered by enthusiasts for its excellent Signal-to-Noise Ratio (SNR) for the price and its hardware support for 5.1 and 6.1 channel surround sound. Windows 11 blocks drivers that aren't digitally signed
However, because this hardware is now considered "Legacy," installing it on a modern operating system like Windows 11 64-bit can be a challenge. Official support from C-Media has largely ceased, and Windows Update often fails to find the correct software.
If you are trying to breathe new life into an old sound card or utilizing a modern "PCI-to-USB" adapter for older hardware, this guide covers everything you need to know about getting the CMI8738 to work on Windows 11. Permanent (Not recommended for security, but works): Run
Because the official driver method is unreliable and requires disabling security features, the retro-computing community has created a modified driver that works natively on Windows 11 64-bit. This driver is unsigned but uses a known exploit to load without disabling signature enforcement permanently.
Some developers have modified the driver to include a valid signature for Windows 11.
Look for: C-Media CMI8738 driver version 8.17.10 modded (signed by a third party).
Installation steps are identical to Method 2 but without needing to disable signature enforcement.
When a CMI8738-based card is installed in a Windows 11 machine, Device Manager will show: