Do you have any of the original or retail OS X 10.5.x installation disks? If not why not manually discard to trash all the unwanted stuff.
You could get an external hard drive (beg, borrow, or buy) with firewire connection and make a bootable clone from which you can run
Disk Utility to wipe the drive.
It will probably be less expensive and a lot less trouble to get a retail 10.5.x install disk off eBay and don't buy an gray colored Mac OS X install disks.
I have the original disk I used to put the os on the computer. It will not let me boot it. It will show up on the desktop, but when I chose the option to install it restarts and does nothing. I don't get the option to erase and install a clean version, or recovery patition at start up.. GRR.... So I could use ccc, make a bootable copy and wipe the disk once i'm running off external? Just cant wipe it while using it if I can't boot from disk, right? Thanks for yoyr response!