what you need to do is type in the model of your sound card an next to that model number type "driver" in a google search tool bar. The drivers are usually found on the manufacturers websites. For example, I have a "Realtech" sound card ....so I type in "Realtech" on google and go to their website and get the driver for my model.
If you have the model number of your sound card, post it here and I will go get it for you and leave the link, with instructions here.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix computer hardware.