Hi rossocenere,
Welcome to the HP Forums!
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Thank you for your inquiry, I am happy to help.
I grasp that you used "DriverTuner" to update the drivers on your system, since doing the updates you do not have audio.
Here is a link to the HP Pavilion dv7-6189sl Entertainment Notebook PC Drivers, which has all the HP drivers for your system. Here is a link to a document to assist you with this issue. No Sound from the Speakers (Windows 7).
You can also run the HP Support Assistant and orMS Fix It to help with updates and resolving issues.
If you have set up the Windows restore , you can restore back to before you did the updates. Using Microsoft System Restore (Windows 7). I hope these are helpful.