I got into the bios again and set the dvd for boot priority. With only the 500 GB IDE drive connected, I was able to install the 64 bit XP.
Then I reconnected the 1 tb sata which has Vista 32 already on it, and I started the computer.
Well no message for selection of OS and it goes directly to XP. So I went into the bios again and set for dvd again and disconnected the 500 GB IDE.
As soon as I entered the product key it basically allowed me to get into the Vista OS that was already on there. Then I installed Vista anew on top of the old Vista.
I do not know whay any of that worked because I had done the same thing before and gotten nothing but that "Verifying DMI data" message.
Now I hope that when I start, with everything connected and Vista on the 1 TB drive being the last OS installed, that it will start with the screen that asks me what OS I want to use, and that it will, if I select XP, go to the 500 GB drive.
Thanks for your help, but per usual, the issue is closer to resolution, without me having any idea why. I'll update this and thanks for the tip about GAG