Hi there, this is going to seem like a dumb question but don't be offended in any way, but is your volume control turned up in wmp? you know the little bar you pull across to turn up the volume, push it to the right. Also can I recommend windows media player 11, which can be downloaded from
Here also on the website if you click on the drop down box next to the words "Select Download"and click codec installation packages you will find there are some codecs that should work on both wmp10 and wmp11, try downloading them and see if you have any luck, hope this helps yours Dave