Leopard Kernel Panic on Installation

I have a 2 GHz Intel Core Duo MacBook with 1GB of SDRAM. I have OS X Tiger v. 10.4.6, and I just recieved Leopard v. 10.5.4, and I am attempting to install it. If it makes any difference, I have my harddrive partitioned - 40GB for OS X, and 30GB for Ubuntu Linux (8.10 Intrepid Ibex), and rEFIt to switch between the two.

I booted into Tiger and popped in the Leopard installation DVD. A window popped open with an icon to install Leopard. I double clicked on this, and it told me to restart. So, I pressed the restart button in the window, and the computer restarted, automatically booting into the OSX DVD. The Apple logo popped up, with the little spinning wheel. It churned for a few minutes, then it had a kernel panic:


So, I did as the notification told me, and restarted. It automatically booted into the DVD again, and the same thing happened. Next time, as a booted up, I held the eject key down, and I was able to get the DVD out. So, I'm back to where I started, but I don't have Leopard installed

There are several minor scratches on the DVD, but nothing I would expect to mess with the DVD.

Another thing: I popped in the Leopard DVD, and opened the Disk Utility after this fiasco, and verified the DVD. I got this error output:

Code:

Verifying volume “disk1s3”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
[COLOR="Red"]Invalid node structure
The volume Mac OS X Install DVD needs to be repaired.

Error: The underlying task reported failure on exit

[/COLOR]
1 HFS volume checked
[COLOR="red"]	Volume needs repair[/COLOR]

However, the "Repair Disk" button is greyed out.

Any help would be GREATLY appreciated. I don't want to go through the Apple Support Hotline...

Thanks,
Arcelios

 

Should I do this while the OS X Leopard installation DVD is in?