I work for a non-profit group and received 4 MACs that have been wiped of all of its information on the hard drive. I order Mac Family 10.5.6 thinking I could load this as the new OS for these computers. In reading the instructions, it appears this is an upgrade set of software. It says to install disk and click on the install icon. Being that these computers have nothing on the hard drives, does anyone have any recommendations on what I should do to get these computer up and running?