it could also be a sample rate problem with your soundcard. I have seen some soundcards that are very unhappy playing back 8khz sample rate. If you have a cheapo sound card, that could be the problem. Most of the old or new soundblaster cards work well, and are recognized by windows without installing drivers. A workaround is to convert the samplerate with a sound editing program. Audacity would probably do it, but I haven't tried it to be sure. Cool Edit would certainly do it, but many people don't have that, and it costs.