Sound missing after installing windows 8.1 pro.

hi. i have a problem. after instaling windows 8.1 pro , sound is missing. i in device manager everything is fine. instaled every driver.
product name:  laptop hp 620.
a day before this, i had windows 7 and everything worked fine.  tried everything. i dont know what else to do. if i dont find a solution then i go back to windows 7 ((

Hi:
The only suggestion I can offer would be to try a W8.1 IDT audio driver...
http://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdDetails/?sp4ts.oid=5229457&sp...

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