How to Reinstall Photo

Insert disc one from your Mac OS software bundle into the computers optical drive. Disc one is labeled as the 'Mac OS X Install DVD.'
Double-click the 'Optional installs' folder on the Mac OS X install pop up menu. The menu will automatically pop up once you have inserted the disc into the optical drive.
Double-click the 'Optional installs installer' on the next window. When the optional installs installer screen pops up, click 'Continue.'
Click 'Continue' on the software license screen. Read through the terms of agreement on the next page and click 'Agree' when you are finished and agree to accept the terms.
Click 'Photo Booth' as the item you want to install. To reveal the full list of programs, click the triangle icon next to 'Applications.' Click to check the box next to Photo Booth then click 'Continue.'
Modify the install location on the next screen if you wish to designate a different location. Once finished, click 'Continue.' When prompted, enter in your administrator password and click 'Install.'
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How to Reinstall iChat

Insert the Mac OS X Install DVD into your disc drive.
Double-click 'Optional Installs.mpkg' to launch the optional components for the operating system.
Click the arrow next to 'Applications,' and select 'iChat' from the list.
Click 'OK' and then 'Install' to reinstall iChat to your Mac computer.
Eject the Mac OS X Install DVD once the package install is complete. You will now find iChat located in the 'Applications' folder.
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How to Reinstall Mail.App

Insert the disk labeled 'Mac OS X Install DVD' into your computer. This is the DVD that came with your Apple computer.
Open the 'Optional Installs' folder and then double click on the 'Optional Installs Installer' icon.
Press the 'Continue' button to advance to the next screen.
Press 'Continue' again, read the license agreement and then click 'Agree.'
Click on the triangle next to 'Applications.'
Select 'Mail' from the list of system applications that can be installed.
Press 'Continue' and then 'Install.' When prompted, enter your administrative username and password. The DVD will now reinstall the Mail.app program on your computer's hard drive.
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