I recently bought my first Mac and am stil trying to figure everything out. I haven't had any problem so far besides that MBP won't let me save anything to desktop saying that I don't have the authority to do so. I was able to install software as long as I enter password to authorize, but this is the only thing that the mac does not let me do. I've asked my friends who are Mac users but they never had that problem to start with. Please help!