I just bought a 2013 MBA 13" i5/4GB/128GB I got it from a guy on CL. It came with Applecare until next July. It was also loaded with iWork and Office. My question is that I have been through the computer and it shows that I only have 76 GB free. What can I do to to see what is taking up all of the space? I wouldn't think that iWork and Office 11 would take up that much room.