Can't connect controllers, actuators, and sensors

For some reason in my Blender i can’t connect the sensors, controllers and actuators in the game engine. Help.

Kind of trivial question but do you have an object selected for your game scope? Otherwise blender doesn’t know what will be under the rules you are trying to set up.

BGE should active in 2.53 , what revision number are you running? has a serie of tutorials on the BGE under 2.5 paradigm which is really good. and up to date. and quite extensive.