OS X 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This article has been archived and is no longer updated by Apple.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 Mac OS or application software with an exact copy of the original software that came with your computer.
To restore the Apple software that came with your computer to its original state, use the Software Restore or installation disc or discs that came with your computer. For detailed instructions, see:
If have backed up your computer using Time Machine, you can use Time Machine to restore your software. For detailed instructions, see:
Last Modified: Oct 31, 2013