Cursor Borders?

I am using my mouse to play broken sword on dolphin, however The cursor on the screen wont go past a certain invisible border to the left and right of the screen. I can move the mouse all the way to the top and bottom of the screen but not into any of the corners (or 3 inchs to the left or right). I have changed sensor bar position from "top" to "bottom" and it only makes the cursor area even smaller and the problem worse. I have gone to the wii menu (pressing H) and the cursor there can access any part of the screen. Any help please!?