HP 620 sound problem

Dear friends, I am new here and I hope that I found answers here to my questions, I have HP 620 with windows seven ultimate... I have sound problems, I can hear sounds in the headset but not on the speakers, I've checked the audio setting and it was good...and went to HP site and the audio driver didn't work 4 me ##sp47808.exe##
hope that you can help me.

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