Try this first:
1 - Start
2 - Click run and enter the word " dxdiag " then enter
3 - click sound 1, sound 2, sound 3 if there's more than 1
4 - right down the name of speaker of the device
5 - post back the name of the device
Another option is to download PC Wizard here: http://www.cpuid.com/pcwizard.php
Install it and open when finish.
Under Hardwares you will see the name of manufactures of you deviceses like:
Post back with that information.