I am running XP/Win7 on my AMD 64 Athlon 3400+ powered Pavillion. I have an integrated Realtek AC'97 audio card and lately I've noticed that all music playback is choppy - whether it's iTunes, Windows Media Player, or Youtube. I've tried different speakers, headphones, etc., but reagrdless of the hardware I use, I still get the same problem. It sounds as if the music is being paused and then played very quickly throughout the song. I don't really notice it in Windows sound effects, but that may be because they are short in length. I notice this happening on both XP and Windows 7 and don't know why. Please help!!!