Right click on "My Computer" and select "Properties". Click on the hardware tab. From this window, click on "Device Manager". Your sound card should appear undor "Sound, Video, and Game controllers." If it does not appear, look under "other devices." If the computer no longer reckognizes it, then it will appear as "unknown device." When you find it, right click on it, select "properties." It should tell you what theproblem is.