i am using my wife's old macbook and it has a 100 GB HD. i deleted her account through the system pref. and setup my own, and after deleting all that it shows I have 50 GB. i am new to apple computers, so i am puzzled that the OS and other basic apps took 50 GB. is there any way to check what is taking up so much room? there is literally nothing installed besides what came with the the laptop initially. if anyone needs more info, please let me know.