Currently Being ModeratedJul 31, 2013 2:14 AM (in response to oeblanc)
If you are in the US call Apple Customer Support 1-800-767-2775, provide the Serial Number and specifications of the Mac, and for a reasonable fee, they will supply a replacement set of system discs (if available).
The discs will be for the original version of the OS that was pre-installed when the Mac was manufactured.
If you are in another country:
You should also then use Software Update to update Tiger to its final version 10.4.11.