The DVD drive is working, if the system booted to start the install.
You should not be selecting a driver for the DVD. I'm not sure I understand your problem. So, let me ask some questions, ans see if we can clarify. Most of them these days work out of the box, however with that old version, I can't be sure.
Have you got some free space on the hard drive? By that I mean space not allocated to any OS ( windoze) or any partition.
A system from Dell would not be shipped with free space. If you have free space, how did you create it?
Here is a link to a how-to.
Is a pdf file you can download. Can you give me a reference point on how far you get?