I'm a bit confused! You say " dont have the xp disc my computer came with it pre installed" and "I have windows xp and i want to get my pc the way it was when i first installed it."
I'm not sure whether you have an XP disc or not! However, if your computer came with XP installed, surely you have a "recovery" disc (or whatever it may be called). The idea being that you can take your machine back to it was when it left the factory.