I have uploaded some new CMedia 8738 drivers to my site. These drivers are different from past CMI8738 drivers (VxD or WDM). These are unified WDM drivers designed to work with the CMI8738 chipset, and the new CMI9738 chipset.
Also, compared to the older drivers, they do not include their own Mixer program. This is good, since the CMedia mixer was pretty cheesy anyway, and offered volume control in the same way the Windows mixer already did. To control special functions of the sound card, a new icon has been added to your Control Panel. You can set 2/4 speakers there, change S/PDIF settings, and mess with EAX/Reverb settings there.
You can get the drivers HERE. They are about 1.6 Megs.