Insert the restore disk for your computer, and look for the "install additional software" icon, or equivalent.
To install optional packages from the Mac OS X install discs:
Insert one of the software install discs into your computer.
Double-click the package file to open the Installer application. The package file icon looks like a box.
Follow the on screen instructions. When you see the Customize button, click it.
Check the boxes next to the items you want to install. To see a description of an item, click the item.
Follow the on screen instructions to finish the installation.
From Apple Help in Tiger.
OSX (any of the upgrades) is just that, the OS only. Your restore disk has the original software that came bundled with your mac. There are numerous reasons why they don't include Apple works with Tiger, the least of which is that it is a stand alone product, and was replaced by the iWork suite. If you are having trouble getting the reinstall to work, then you might look to something like
open office in the short term. You will have to install X-Code, but that is on the Tiger Disk.