So... somehow, Preview has completely disappeared from my macbook. The only documentation I can find says to back up your data then erase and reinstall Mac OS X from the installation disk. I honestly don't remember ever seeing an installation disk in my macbook box, and I certainly can't find one anywhere (and I still have the box, if that tells you how anal I am about keeping things). So is there a way to get my hands on one? Is there a way to download Preview from a site? HELP!