"Realtek AC'97 Audio for VIA (R) Audio Controller" is not an adequate description of your sound device to help you. Please provide the following:
1: is audio integrated on motherboard or add-on?
2: If integrated, please describe the motherboard by brand, model, and bios id string.
3: Audio chipset number.
If you unable to provide that info, please use the following software and then submit a Summary Report from Everest.
To find make and model of pc hardware, EVEREST Home Edition is a free system diagnostics, system information program that will id most hardware onboard a mb.
Alternate Everest download link: (offers 2 sites to dl program from)
Run the program and then:
Click on Computer
Click on Summary
Right hand window (hardware) if the text is blue
this is a link to the web site for that particular hardware.
If you need additional help, please post a SUMMARY report from Everest.