try to trace the boot process of the CD and make sure, that a CD driver gets loaded.
You wrote, the CD brings you to a DOS prompt.
In that case, I assume, the DOS prompt shows something like:
If so, you have to change to the CD drive by typing:
and press enter.
Maybe you have to use another drive letter, depending on how many drives are installed to the pc.
If d: isn't correct, simply try e: f: g: one by one.
When you're at the CD drive, type in the following 2 commands and hit the enter key:
Report back the result.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!