Sounds skipping and missing in some areas on media player

I have windows Xp, I bought the computer in 2003, I have a Sound blaster sound card by creative installed. Most of the time, when I try to play media files, I hear the computer skipping and missing like a scratched CD, What is the problem and how to fix it.

Oh, I almost forgot, if it helps or means anythin, my burner is broken and won'r open or play cds and also it won't brn cds, I have to pry it open with a knife if I ever want to open it. The skipping thing is really what bugs me though