Optiplex GX280 and Garbled Sound

I have attempted to reinstall the driver provided by dell, other misc soundmax drivers of different versions, wiped out and reinstall all the codecs on the machine, reinstalling windows media player, itunes, and quicktime in various sequences and still have not been able to get proper sound out of the computer.

 

The computer was playing sound correctly a few days ago. I unfortunately do not know what caused the sound to stop working correctly. The sound plays incredibly compressed and various volumes at certain frequencies/channels are way down. ie. You can hear the background music but barely hear the vocals. And even then it sounds like it's underwater or being played from a low bandwidth internet stream.

 

It's not the music file itself as it plays normal if I listen through the headphone jack of my ipod. But any sound/music file played on the computer is not correct.

 

I'm currently running windows XP professional version 2002 sp2. Anyone have an idea how I might be able to correct this?