I just started a new job and the computer I was given is having a problem with playing wma and mp3 files. The files play but there is no sound. It will play startup sounds and other program sound files so I know the sound card is good. I tried reinstalling Windows Media Player and it did not help. I installed MusicMatch and have the same problem. I reinstalled all of the sound files that came on the Dell Resource CD for the computer. Does anybody have any other ideas for me to try?