I have a mid-2010 MBP (2.66 Ghz Intel Core i7 with 8GB 1067 MHz DDR3 RAM and Intel HD Graphics 288 MB) running 10.8.5. I would like to completely re-format the computer (i.e wipe the HD other than the OS). Could someone give me instructions on how to do this? Or alternatively, should I consider upgrading to a more recent OS? Thanks!!!