Sounds randomly don't work

[mtgordon]

Last night I was playing on Bodog, Empire, and Pacific when all of the sudden the sounds were no longer working. I Turned on Windows Media Player and was able to play/hear mp3s and wav files. I restarted my computer and the sounds were back. I was playing again just now and the sounds went out again. I tried restarting Empire but the sounds are still gone. Anyone have ideas about this? The only thing I can think that I did yesterday was to install CuteFTP and download a song from one of my friends. Thanks for any help you can give me.