OS X Mountain Lion: Restore your computer’s software
This article has been archived and is no longer updated by Apple.
If you delete some Apple software or have software problems you can’t fix, you can restore some or all of the software on your computer to its original state. Restoring software replaces your OS X or app software with an exact copy of the original software that came with your Mac.
For instructions on restoring the Apple software that came with your computer to its original state, see this help topic:
If you have backed up your computer using Time Machine, you can use Time Machine to restore your software. For instructions, see this help topic:
Last Modified: Sep 4, 2015