playback sound slow-mo

I recently installed os xp pro on a pc that i think is able to handle it. Processor speed of 433mhz + 128 megs of sdram. It also has a 18 speed cd burnner & cd player and records just fine, music or data cd’s using either easy cd creator or nero burnning rom. The problem i’m having is that the playback from the pc’s player or burnner is in slow motion, some times it starts playing fine (regular speed) then slow’s down.
This pc is using dial-up modem and the service is AOL and when the AOL welcome voice comes on it is in slow-motion too.

any help is appreciated

Manuel garzam@bcsd.k12.ca.us