I'm having audio issues with my hp pavilion dv9910us laptop.

The day before yesterday the sound was working perfectly.. Yesterday I noticed I didn't have any sound so I checked under control panel- hardware and sound and tried to adjust the volume and it says "no audio device installed". Then I went to Device manager to sound, video and game controllers and checked properties and it says the device is working properly. I tried downloading sp42090.exe (an updated driver) but I can't install b/c it says it's already installed. This is so frustrating, don't know what to do. Any  help will be appreciated.

Welcome to the forum.
Hmm..  sp42090 appears to be the touchpad driver patch (for Vista 64bit).
Not an audio driver.
Here's the Vista Audio help file to get help get you started:
http://h10025.www1.hp.com/ewfrf/wc/document?docnam​e=c00833257&cc=us&dlc=en&lc=en&product=3740565&tmp​...
The Audio help page does have some things to try and even a "Mr. Fixit" button.  It may work - I can't test it for you, I'm running Windows 7.  Smiling.
Here's your Software and Driver Page:
http://h10025.www1.hp.com/ewfrf/wc/softwareCategor​y?os=2100&lc=en&cc=us&dlc=en&sw_lang=&product=3740​...
Sounds like you've done some homework.
It's not "disabled", is it?  Right click on the sound icon to check...
Nevermind - "no audio output device" is not "disabled".
If the system can find the driver in its own internal backup, it will do so when you reboot the system.  If not, then you start looking for it at the posts above.   Keep us posted - lots of smart folks here to help!
Hope this helps!
Kind Regards,
Dragon-Fur

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