If you can answer the following questions, it might help us help you a bit faster:
1) What is the exact make/model of your computer. If it's a DELL the Service Tag number would be great
2) Is the Audio card the same one that came with the computer when it was
3) Do you know the make and model of your audio cared?
and...most importantly..
Which version of Windows are you using (and if it's 64 bit, please indicate so)>