SP76021.exe is a specific HP SoftPaq utility designed to install the HP Hotkey Support Driver
Installing this specific version (v6.2.20.8) often fixes the following hardware-related issues: HP Support Community Screen Brightness : Resolves cases where do not adjust the display brightness. Microphone Key : Enables the toggle for disabling or enabling the microphone. On-Screen Indicators sp76021exe
To ensure the driver works correctly, it is often recommended to install it in a specific sequence ( Repair Wiki ): SP76021