You done good. Open that file called drivers and see if they have anything for Sound. You may see something like AC97, which stands for Audio Codecs97.
What you should be able to do is gp bacl into control panel under audio/sound, and in the Sounds and Audio Devices section, click the Hardware tab, click the Properties button, and then the Driver tab.
Under the Driver tab, you'll have an option to install or update the driver. You should be able to use a Browse button to direct the system to look in that driver folder on that CD in the CD-ROM.
Let us know if this works, please.
Thanks,
Brian