Hi!!!
You could try running sndconfig and try to set up your sound card. The best though, is always to have a non inbuilt sound card. I've bought a really cheap pci one called Zoltrix, a 4 speakers one
. I actually choose that one because in the box it stands "Requires Win9x/ME/2k and Linux". Glad with this in the box, which btw, not many companies do it, I got the card for about 12-15 USD and works great