Audio problem software related

I have a strange audio problem that I have not been able to fix. I'm
working on a Sony Viao PCV-MXS20 running Home edition SP2. Here's the
deal.

I can play an audio CD with no problems. I can play internet radio
stations with no problem. I can play iTunes video, though the audio
has an occasional "pop." I cannot play any wav files. DVDs show
video, but no audio.

I have uninstalled all media programs except iTunes and Windows Media
Player 10. I also uninstalled all DVD/CD writing software and
reinstalled only the DVD player software that came with the computer.
I have remove and reinstalled the sound card. I have uninstalled and
reinstalled the DVD drive with current drivers. When I reinstalled
WMP10 I got one wav file to play, though it was a stream from the
internet. After inserting a DVD I was not able to get any other wav
files to play. The DVD had no audio either. If have also installed all
Codecs that I could find.

I believe this must be a software issue. Is it a Windows system file
problem? If so, can I fix it without reinstalling windows?

.

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