Hi,
Ok, it looks like the HP Audio Control is a proprietary program from HP.
I'm thinking that this has either been replaced by a newer driver (for something like Realtek Audio for example) or that it runs from the Control Panel and wouldn't actually show as a regular 'App' that is selectable from your normal programs list.
Can you check the following for me please:
In the search box on your Taskbar, type the following: CONTROL PANEL
Then click on Control Panel (App) in the results.
In Control Panel, in the upper right corner of the window where it says "View by:", make sure this is on "Large icons".
Go through each item in Control Panel and see if you can find "HP Audio Control". If not, see if you can find another Audio Control program.
Let me know how you get on.
Kindest regards,
Neil