reformating?

ok so i want to reformat my laptop becuase im using a fkn load of memory im using like 2.49 gb and i was below that.or is there anyprogram that can reduce my memeory usage?mainly want this for ca lol cuz i thin k y memeory usage cuases lagg too.

whoopsie i passed that number like 3 times rofl.deleted 2gigas from my computer in my download section now i need all my rograms that i dont need like photoshop