I hear no sound from my hp dv7 laptop after windows update

And, in all of a sudden, i have no sound at my hp laptop,  right after I updated my windows vista. I tried the ''system restore'' solution, but it did not solve the problem. I cant even play the test sound, because I see the error message : ''failed to play test tone''.
My model number is dv7-2030eV and my product number is NQ560EA#B1A. My operating system is windows vista 32-bit.
Any help is appreciated. Thank you in andvance and Happy Holidays! 

Hi diboz. "enlightlanka" made a good point, a driver reinstall would be a good step. If reinstalling doesn't resolve this issue, here are some more steps you can try.
Resolving No Sound or Audio Problems (Windows Vista)
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00833257&tmp_task=solveCategory&cc=us&dlc=en&lc...
I hope this helps.
TwoPointOh
I work on behalf of HP
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