Audio is screwy on the computer.

[Archduke Tips]

There was a feature for my soundcard (Audigy 2) that allowed me to modify the sound, including one that made everything "chipmunk" sounding.

Do you know what audio card you have or what on-board chip it is? That will be immensely helpful in diagnosing this problem. Also, what kind of speakers do you have and how do you connect them to your PC?