Missing drivers after upgrade to Win 7 in HP pavilion dv9500

 I upgraded my laptop to Windows 7 32 bit and everything works except from 2 base system devices listed in device manager that need work. What should I do?

I have the same problem with you but I found out once you upgrade your pc to windows 7 there's always an issue. You'll try calling HP Tech, and they will refer you to PC techinician nearest to you because they said there's something wrong with you HD blah blah or your sound card is gone...need a new one. Well I nearly believe them until I stumbled what's causing my problem and I fixed it myself. Now I have no problem with my sounds missing or audio device missing. My Laptop has voice now non-stop.
The problem that cause wasn't about the hard drive or the sound card but it is about the CONFIGURATION OF YOUR PARENTAL ACCOUNT CONTROL IN WHERE YOUR AUDIO SOUNDS HAS TO BE USE. AFTER I SET MINE TO WHAT IS SUPPOSED TO BE THE RIGHT OPTION, SINCE THEN I HAVE NO MORE PROBLEMS ABOUT MY SOUNDS OR AUDIO DEVICE MISSING OR NO AUDIO DEVICE INSTALLED.
SOLUTION; Click Start/Control Panel/User Accounts and Family Satefy. Click Parental Control. In the box at the LEFT SIDE you will see GAMING RATING SYSTEMS. Click Gaming Rating System and click administrator box Yes(if come out). In the box you will see some LOGO ICONS for you to choose in which gaming rating you want to use your sounds. This is where you must configure your computer what rating is compatible to use to run sounds in your Windows 7 from Windows Vista or Xp.
The previous option in my Laptop was in the 3rd option ESRB. Then I move it to the 2nd option that the LOGO is written in Chinese Language( Computer Software Rating Regulation). I click OK and then Restart. Since then I have no missing audio or missing sounds problems. 
I hope that helps.

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