Thanks for quick response . The tracks ran perfectly when I tried them, originally, on my desktop PC, using XP. They were ripped from CDG with the intention of running karaoke from a laptop.
The problem has arisen since I bought a new laptop, using Vista. Could this be a problem with the soundcard (Realtek High Definition Audio)? The machine is a PACKARD BELL
EasyNote EasyNote MZ36-T026, with onboard sound. It doesn't have a recording function on the computer (although there is a mic input.