I needed a driver for a Oak Tech. Rock 16 sound card with crystal chip set CS4231-KL EP. this seems to work. just make sure when you unzip it that the unzipper dues not install it. you will have problems. Instead after it is unzipped go to the file it was expanded to and install. if you need you can go to www.drivershq.com/list/indexsoundo.html then click on the link to "Oak Drivers and Audio/video FAQS"(its on the left), then click on audio for the drivers for different operating sys. the driver works for me even though windows informed me that it was the wrong driver. Good luck to all.