USB 4.x Audio / MIDI Driver is a software product for Windows developed by Focusrite Audio Engineering, Ltd.
It is reported that the following Windows processes are part of USB 4.x Audio / MIDI Driver:
If you want to remove USB 4.x Audio / MIDI Driver from your computer, just go to Start > Control Panel > Add/Remove programs and select USB 4.x Audio / MIDI Driver from the list of programs.