[CentOS] Problem installing from CD

Good morning,

I hate to bother everyone again, but I'm having some more trouble. I have a new machine with an MSI RS480M2-IL motherboard (ATI Xpress200 chipset) and a Hammer DVD Writer (shows up as a Matshita DVD-RAM SW-9585). I get the CD to start (in text mode - don't know why I can't do VGA or better), and it asks me What type of media contains the packages to be installed. I choose CDROM and then it says:

The CentOS-4 x86_64 CD was not found in any of your CDROM drives. Please insert the CentOS x86_64 CD and press OK to retry.

The funny thing is that this is Disk 1 of x86_64. Any ideas? I've tried a couple of different download sites and I always get the same problem.

TIA!

Jeff