Mac OS X software cannot be installed

Hi,
I'm looking for comments on the following problem that I'm having:
I have a Mac Pro that I'm unable to re-install the operating system (os) on any internal or external disk that I give to it. Currently it is booting off the optical disk (Mac OS X Install Disk 1) that was provided with the machine when purchased. 10.5.5 is the version of the os that is printed on this optical disk.
Prior to this attempt at re-installing the os, the os was 10.6.6 which was downloaded.
I am attempting to re-install the os because the hard drive that the os was on failed -- was not repaired after running "Disk Utility.app".
The situation at present is that I am booting off of the above optical disk, and after I select which language I want to proceed in a window appears and states ``Preparing installation ...'' and then goes away and is replaced by a window that states, ``Mac OS X cannot be installed on this computer.'' With two radio buttons ``OK'' and ``Restart''. If I click ``OK'' then the other applications like "Disk Utility.app", "Startup Disk.app", "Terminal.app", etc. are available.
Also, at present, I have four 2 TB disks mounted internally (all are readable and HFS+ formatted) via "Disk Utility.app" and the previous os disk available to mount via an external USB drive.
Again I'm looking for comments in regards to how I might resolve this issue. At the very least re-installing 10.5.5 on one of the internal disks so that I can proceed with some fairly critical environmental monitoring data processing would be less than ideal but satisfactory.
Thanks in advance.
Kind Regards,
Dan

Start over. Go to Utility menu in 10.6 DVD and choose the drive, click on PARTITION, set drop down list to one partition.
Make sure to check OPTIONS.... for GUID just for fun, click APPLY.
If you want, just have one drive you want to use.
Buy Alsoft Disk Warrior and use that in addition to Disk Utility to repair drives.
Use SuperDuper to make two good backup clones for every drive.
Disk Utility First Aid will not fix or recognize, and therefore there are problems it won't repair.
If DU can't format or hangs on "Preparing" that can mean a bad sector was detected in the first and last block of sectors (hidden, used by GPT).
10.6.6 may be a download but you have to have 10.6.x installed first.
If you want Leopard only use that, otherwise you dont' need 10.5.5 at all.
And always use the latest version to format, install, and repair with.

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