Mouse Trap

My mouse is giving me the absolute shits. The left-click button has become so sensitive it double-clicks practically everything! It makes using the mouse like trying to drive on ice! And I don't know what the problem is!

At first I thought it was the mouse itself, so I switched over the old one for another one I had spare. The problem continues. I tried to turn down the sensitivity in the Control Panel, but it was already at its lowest point! I have no idea what the problem could be!

ARRRGH!