I've also run into similar issues with the C-Media CMI8738 driver after upgrading to Windows 10. It can be quite a headache trying to find the right drivers that won't turn your sound system into an avant-garde noise machine!
Firstly, it's crucial to download drivers from official sources or trusted third-party websites to avoid any unwelcome surprises (like extra "features" in the form of malware). For the CMI8738, you can usually find updates directly on the C-Media website or sometimes through your computer manufacturer’s website if it's a pre-built system.
If those options don't pan out, another route is using Windows Update. Occasionally, Microsoft provides generic drivers that could solve basic functionality issues. Just go to Settings -> Update & Security -> Windows Update and hit 'Check for updates'.
As for troubleshooting conflicts, I’d recommend diving into the Device Manager (you can search for it in the Start menu). Look for any audio devices listed with a yellow exclamation mark which indicates a problem. Right-click on the problematic device and select 'Update driver'. If that doesn’t work, right-click again and choose 'Uninstall device', reboot your PC, and let Windows attempt to reinstall the driver automatically.
And remember, updating audio drivers isn’t like making soup – you do need precise ingredients but thankfully no stirring is required! Best of luck with getting everything sounding right!