HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedFeb 8, 2013 8:00 PM (in response to vane07)
What is the Operating System of your Mac...?
Currently Being ModeratedFeb 8, 2013 8:01 PM (in response to vane07)
If you're selling or giving away the computer, throw any files which may contain sensitive data in the Trash and securely empty it.
Restart from the computer's original disks(or the recovery partition if it originally shipped with Mac OS X 10.7 or newer), use the Disk Utility to erase the drive, and install a new OS.