There is no such sound chip as cmi9738 posted on the Cmedia website.
Perhaps you meant cmi8738 instead. I did find cmi9738 drivers but they were not posted on the Cmedia website. There's 4 links to this driver listed on this page:
I also believe this is a SiS 7012 chipset... drivers for it are posted on the VIA website.
(but I was unable to find that driver.
Lets settle what your sound chip is. Either provide the computer brand and model or open Device Manager, find and double-click the hardware device you need a driver for, click the Details tab, select "hardware id" and give me the hardware id string that begins with "PCI\VEN", (1st./top line of text only).