first of all what makes a laptop fast or slow? is it the processor or ram or what? i need a laptop that has 15-16" screen hi def widescreen. and i'm going to college for computer science and i need a computer that is fast and doesn't freeze up. don't have the money for a mac. basically can u find a computer for me just for surfing, music, watching movies, and i'd like to be able to put a game or 2 on it. i would like to be able to download some things without slowing my comp down. and am trying to stay in the range of 500-700 US dollars. please help.