because when you even try to close kazaa, there is still something in your system saying it is still open, thay just want to be in your system without you knowing that is why when you open an aplication it will say you did something illigal, meaning there are several software you can't use untill it is off. and to turn it off you must uninstall, my brother found out looking at the registery, the only one that is STILL good is probably kazaa lite, and some other one that i cannot say i read an article saying if you have too much stuff in your hard drive (about 20 gigs or so) you casn go to jail, either for copy right rules or something else, my buddy had only 4 gigs and got a warning by aol !!! so watch it foo dam