Thanks...I had read through those posts and others, but I am not sure that my sound card is the problem. First it only happens to some songs not all and second it didn't matter what computer I was using (both are less than 2 months old). I have noticed that the "chipmunk" speed continues to happen no matter how many different files of that same song I download. And also it is only happening with mp3's when playing back with WMP.