Could someone help me with instructions for doing a clean install for iMac with mountain lion 10.8.4 ?

   Could someone help me with instructions for doing a clean install for Could someone help me with instructions for doing a clean install for an early 2009 iMac 20"  with Mountain Lion 10.8.4 ?
   Thank You,
                            leetruitt

   Barney,  William,  nbar, Galt\'s Gulch:
   A nephew stayed with us to take a course at the local community college last semester. I allowed him use of my mac for research just after I installed Mountain Lion. He decided to "help out" and ran a 3rd party clean and tune up app., Magician.  The tune up wiped over 1200 titles of my music in iTunes,  also a path of folders with names containing nothing but more empty folders with names. Almost every program I open and run for a short time crashes, also folders and programs are in wrong places, or cannot be located (the nephew, for instance). Up to this time I have always been able to track a problem far enough to resolve it by careful persistence and good luck, but I do not have the tech savvy to solve this one without getting in deeper. I have run disk utility saveral times and always get  variations of this:
ACL found but not expected on
"private/etc/resolve.conf"
"private/etc/raddb/sites-enabled/inner-tunnel"
"private/etc/rabbd/sites-enabled/control-socket"
     Also, after four years of intense daily use it is cluttered with much junk,  and every app that I was curious about, and I am a very curious guy.
   So I know my limits, (and now my nephew). I dumped my pc for a Strawberry iMac a few years ago, and so far every problem I've encountered, or brought on myself, the Mac has resolved with its own inner elegance - in spite of my novice bungels - and now I honestly feel ashamed, in addition to the need to apologize to a machine for allowing a peasant into the Royal Grounds - so I am calling the Wise Ones in for this one.
   Crazy, I know, but to me a Mac represents something far beyond the ordinary  input ➛ process  ➛ output  title/function customarily assigned to a machine - I sense an odd kind of morality involved, one that I need to respect.
    So, these are my reasons for wanting to do a clean install, correctly.
        Thank you,  Truitt

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