Hi Guys, I have a question for you.... I have a Macbook which I bought new in Feb this year. I came home from work today and my boyfriend told me he'd had a clear out and thrown away my macbook box. But had found a disk in there and decided to install it- to be on the safe side. He had infact installed the Mac OS X dvd... (grrrrrrrr) All seems fine....I did panic thinking he had changed it back to factory settings but my question is, has he harmed the mac in any way by installing something that was essentially already installed? Also would it have used up much memory?? Thanks!