Presario 6000? It might be a little poky with standard Ubuntu or Kubuntu, but it will be fast enough with Xubuntu or Lubuntu. Ubuntu (with GNOME) and Kubuntu (KDE) will use more horsepower and memory; Xubuntu and Lubuntu use less memory and might be better choices. Your mileage will vary, of course.
Sounds as if the DVD was either
1) Burned on a DVD-RW disc, and those can't be a System disc, or
2) Was not burned as a bootable disc, or
3) The disc didn't record properly.
The first is easy to check; eject the disc, and does it say DVD-RW on it? If so, then reuse it for some other purpose.
Some Windows apps don't make bootable discs. You might also have recorded it in non-bootable mode. If the program you use offered to let you add more to the disc later, well, that isn't doing to make a bootable disc. Instead, make sure the disc you burn 'finalizes' the disc. http://cdburnerxp.se/ and http://www.imgburn.com/ are free apps which do burn bootable CD and DVD discs.
Sometimes, a blank disc is bad, or there's dust on it and it doesn't record properly,, and in either of those cases, discard it and try again.