It's a Sony VAIO laptop running Windows 7. It did play them, now it won't. It still plays store-bought audio CDs just fine, and will both play and burn DVD's, but can't get it to play MP3 CDs I burned from another computer. Is it a setting I need to change? The MP3 CDs are not corrupted as they will play just fine in my truck's player. and the computer they were burned from.