If I were to run the disk utility that asks for the CDs that come with the MBP, what will that do? It is a software utility of sorts. Can I just re-install the basic system files for the OS, or perhaps even just download or copy over from another computer the "Preferences" file? This seems too simplistic, but I am an ex-Windows user. Help. Don't want to format and re-install or anything of that nature if possible.