A bootable disc has something on it. This could be a live Linux distro, an installation disc for Windows, or something like the Ultimate Boot disc.
The Ultimate Boot CD ISO file can be burned to a DVD rather than a CD, which is what you would need to do in this case. Unfortunately, you'd need access to another computer with a working DVD burner to make this disc.
Once you are certain that your computer is set to boot from the optical drive first, you just insert the disc in the drive and reboot. If the drive can read DVD's at all, it should boot into this bootable disc. You don't have to do anything else, you're just trying to determine if the drive can read a DVD outside of the Windows operating system that is already installed on your hard drive.
If it can read the DVD, and open the bootable disc, you know the drive is functional, and your problem is in the operating system. This is usually fixed with the registry solutions found at that Microsoft site. If it won't boot using the disc, then your drive is probably defective.