You need to post details regarding your specific system model, operating system (presumably Windows 98, given the location of your post) and the audio device that's installed on your particular system, i.e., Creative Sound Blaster, Turtle Beach Montego II, etc.  Another option (if you know the aforementioned details) is to simply use the Product Support button (above left) - Downloads link, enter the necessary information, and download the appropriate drivers from the web.  Once that's done, use the same Product Support button, Reinstall Guide link, and view the installation instructions for your particular system/audio device.