Gateway GT4022 PC Desktop "mouse ajustments" Questions

...and hold down on the slider in the 'Volume' dialog box. As you are holding down on the left mouse button, drag the slider up to raise the volume or drag the slider down to lower the volume. ...

...in them. The only way i can see what behind the picture i have to right click each one with the mouse twice. It's very annoying. Espially, when I am looking for something. what kind of box? where ...