No Sound - Audio Output Device has stopped working

Hi.
I've recently bought a new HP Pavilion 15 Notebook PC Product Number F4T62EA#ABU with Windows 8 64-bit. The audio device is a Realtek High Definition Audio device.
All was working fine until a few days ago when the audio device stopped working. Here is the device status:
"Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)".
I've tried to update the driver for the device but it is already up to date. Can anyone let me know how this can be fixed please?

Hi mailman1326,
Welcome to the HP forum!
Thank you for your inquiry, I am happy to help!
I understand that you are getting the error "Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)".
Have you made any changes? Did you update to Windows 8.1?
Here is a link to the software and driver page for you computer. HP Pavilion 15-n098sa Notebook PC Drivers. You can use Windows restore to go back in time to when it was working correctly. Using Microsoft System Restore (Windows Vista). You can do a Performing an HP System Recovery (Windows 8) to restore back to factory. You could also run the built in troubleshooter to help.
Follow these steps
a. Press Windows key + C to open charms
b. type in troubleshoot sound
c. select troubleshoot sound on computer and follow the on screen prompts.
Another suggestion is to run the HP Support Assistant. Please let me know the results.
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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