Having problems with a bad install of Photoshop. It has left pieces of its program all over my OSX and despite some great advice, the essential registration information cannot be removed. I'm thinking of just formatting my Mac and reinstalling OSX. Really, it's no big deal for me. It will take me a few short hours to complete and I'll probably find it a rather relaxing thing to do on my day off. So, besides the obvious question of exactly <i>how</i> to boot up and reformat/reinstall, I have other questions first.... BACKUP Fortunately, I have a .MAC account that I can backup some aspects of my computer. The main thing I need to back up is my <b>Mail</b> and every single bit of content in it (FOLDERS, EMAIL, ATTACHMENTS). 1. Will .Mac take care of that? Will .Mac also automatically enter my COMPUTER USERNAME information as long as I provide the password? I also have the BACKUP that I know can be configured to back up and restore certain programs as well. REFORMATTING & REINSTALLING Okay, in easy steps, from rebooting to inserting original install discs to certain things I need to look for during software install.... 2. How exactly do I go about reformatting, rebooting and reinstalling OSX? Thanks in advance!