If you already tested audio drivers from LG and Dell, but still not have Stereo Mix under Windows Vista you can try this driver from Intel: https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=19282&keyword=idt&DownloadType=Drivers&lang=eng According my subscribers this driver work perfect on DELL Inspiron 1525, Dell Lattitude D531 and  Dell XPS M1530.

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