Bought a nice little mac book today from a college student on craigslist. It's in mint condition and I'm already in love with it. She took good care of it. I'm so frkn happy because I've been wanting to switch to Mac for YEARS. I'm not sure if I should wipe the system and reformat it or leave it the way it is. I mean the hard drive is virtually empty, but it has Microsoft Office on here that I know will be gone once I reformat. And also, safari keeps asking me for some login keychain. Anybody know what that is and how I can turn it off?