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Update of drivers usually fail. Instead, Download the audio driver from the Compaq site. Uninstall your audio driver on device manager, right click my computer, properties, hardware tab then device manager, look for sound/audio then uninstall it. Then after, execute/run the updated driver you downloaded. This works 100%.
ihave compaq c797vu model for audio headphone and speaker use conexant smart audio 221 driver,it solve your problem i have problem of touchpad ,do u have proper touchpad driver and how to confiqure,please tell me