Hi everyone, i've just recieved my first MAC ever. (MBP C2D 15" 2.33ghz) What should i keep in mind when i start using it? Should i reformat it and install the OS again to take out junks that i dont need? What should i check to see if the computer is running on par. Please give this newbie some advise on how to handle my first mac. Thank you very much for the help!