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It only moves when you left click. Therefore you must be left clicking everytime it moves. You move the camera around by clicking and holding the middle mouse button, not the left mouse button.
EDIT: And if you are not talking about Blender's 3d cursor/crosshair, then your screenshot didn't pick up whatever you are referring to. Maybe you accidentally hit "C" for the circle selectd tool? Try right clicking in the 3d window, or hitting esc. If you accidentally turned on the circle select tool, that is how you can turn it off.
The usefulness of the 3d crosshair isn't somthing you really need to worry about until you are more experienced with 3d modeling. Just for now, where the 3d crosshair is, is where a new object will be added to your scene when you add something.
If it was the circle select tool that gave you the issue, well that one is obvious. Instead of selecting things one by one, the circle select is another method that lets you select a bunch of things at once. When you have it turned on, scrolling the mouse wheel should make it bigger or smaller.
To enable it again, do the same but now mark the checkbox.