Look for the audio source.
The first place to look is where you are plugging in your speakers on the back of the computer's case. If you are getting your sound from the same collection of connections where the keyboard and mouse connect you are using the integrated audio from the motherboard.
If you are getting your sound from a connection of one of the PCI slots then you have a sound card. You may have a connection for both. In this case you need to go into BIOS on startup and disable the integrated audio. The next time you restart windows should see your sound card as new hardware if it had not done so before. Hopefully windows should be able to provide suitable drivers on the spot.
If you have only one audio connection and it's on your motherboard the integrated audio may need to be enabled in BIOS.
If all else falis you'll need to open your case and find any identifing logos or part numbers on your motherborad and\or sound card and search the internet for drivers.
Hope this helps! I don't know of any utilities to tell you what you want... hopefully someone else has that info.
