Generally Windows system comes with Realtek HD Audio Driver preinstalled for managing sound tweaks.
The Realtek HD Audio Manager is an important utility packed with Realtek HD Audio Driver.
Check the 4 ways below for how to reinstall it.

Way 1.
Way 2.
Manually Download Realtek HD Audio Manager Windows 10
This post introduces Realtek equalizer Windows 10.
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Check how to open and adjust Realtek equalizer controls, fix Realtek equalizer missing or not working issue.
Way 3.
Way 4.
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MiniTool Power Data Recovery is a professional free data recovery software compatible with Windows.
It is capable of dealing with various data loss situations.
Even novice users can use this tool with ease.
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Choose the target gear, and scan the gear.
Find and save recovered deleted/lost files to a new path.