Your system natively supports Vista or higher OS that's why this problem occurs...
Try to install Vista or Win 7.Then it will be OK.
The same problem was with me as well.I used to have C737VU.
I have lost audio on my laptop, I have tried to reinstall drivers, done system recovery 3 times and...
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I have lost audio on my laptop, I have tried to reinstall drivers, done system recovery 3 times and the audio only work for a little while after I do this. I have no idea what else to do!