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HP Omni 120-1126
Microsoft Windows 10 (64-bit)

Hello everyone, This is driving me crazy. When I lower the audio volume with the slider downward the audio volume goes back to 100%. I read the forum, and attempted to download sp78631.exe several times but it always failed citing network error.


I'm using windows 10, 64 bit, Realtek High Definition audio driver

Can anyone help me please.

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Hi @dtc1,


Good Day. Thank you for taking an interest in the HP community. I understand that you require assistance regarding the volume on the computer dropping after some time. I will be really glad to assist you here. Fabulous description and superb diagnosis of the issue before posting. Kudos to you for that. 🙂

To assist you with accurate information I would require more information regarding this:

  • Did this happen after a Software or Windows update?
  • Did you connect an external headset and check if the volume drops with the headset also?

For now, try these steps:

  • Right-Click on start button> click device manager> expand sound video and game controllers>then select the sound drivers and right-click on it and uninstall the audio drivers. Then check the box delete the software for this device.
  • Then restart the computer and update the chipset and audio drivers from this link: and follow the on-screen instructions.
  • Although the drivers are for Windows 8, they should work with Windows 10 also.
  • If you are unable to download the drivers because of network errors on this computer, then download it to a flash drive from a different computer at a different location such as a library and install it on your computer.
  • Now check if the situation has been corrected.

If the issue persists, then try these steps:

  • Windows Audio is a Windows service that manages audio for Windows-based programs. If at all this service is stopped due to any reason, audio devices will not function properly.
    To fix audio services, open the run command and launch services.msc.
  • In the services window search for Windows Audio and right-click on it to select Start to start the audio service.
  • And ensure the Startup Type is set to Automatic.
  • Click Apply and OK.
    Restart the computer and check if it works.
  • This should do the trick for you.

If the problem continues, then follow the all the relevant steps that best match your issue from this guided troubleshooter  (HP PCs - No Sound on HP Computer)and check if it gets fixed.


Finally, check by creating a new local user account as an administrator from this link: and this should fix

the issue for you.


Please perform all these steps patiently as it is critical to resolving the issue. The trick is to remain patient. 

Hope this helps. Let me know how this goes. I genuinely hope the issue gets resolved without hassles and the unit works great.


To simply say thanks, please click the "Thumbs Up" button to give me a Kudos to appreciate my efforts to help. If this helps, please mark this as “Accepted Solution” as it will help several others with the same issue to get it resolved without hassles.

Take care now and have a superb week ahead. 🙂

I am an HP Employee

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