A lot of the motherboards we supply have onboard sound, and the chip name you provide sounds like one of them.
Check the rear of your system for the audio ports. Onboard soundcards have the holes at the upper end of the back of the PC. Below or next to the USB ports. The Audigy card would have the holes further down below the port to which you connect your Monitor cable.
I cannot be more specific without seeing your PC's specification.
If you wouldn't mind, could you possibly email me at [email protected] remembering to include your order/serial number along with your screen name (LANDCRUISER). I'll take a look at your PC's details and get back to you.