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01-06-2012 03:46 PM
Did you try downloading and installng the Realtek Audio driver directly from the Realtek site?
Accept the agreement. Download and install either the first or second file listed depending on whether or not you installed a 32 or 64 bit version of Windows 7.
I have a dc7600 and that did the trick for me. I couldn't get any sound from the internal PC speaker.