This happened to me, believe it or not. It still does it every once in a while. I have an nforce 2 chipset with the soundstorm audio as well on my Abit NF7-S mobo. I never got it fixed, and it still does it to this day. It's only bad when I try to access other files while I'm listening to music. like if I was to open a notepad file while listening to a song it will skip.
sometimes, when it's REALLY bad, the mouse and/or keyboard seems to make the mp3s skip as well. never got this issue fixed