Are you sure it is trying to boot from the CD? Chances are it won't be trying to boot from disc by default. hit f12 on the BIOS splash screen and make sure the Optical/CD/DVD option is selected.
If it still comes up as disc error, then it would seem logical that the optical drive is fried. At that point you could try booting from an external optical drive, or from a USB flash drive (instructions to create the USB boot are on that same page I gave you earlier). Some older PCs don't support USB boot, but with Dells you would probably need to be more than 5 years old.
If none of that works, I would just get a new PC. Assuming your HDD is intact and functioning, data recovery becomes a task of removing the hard drive and just dropping it into an enclosure and copying the files to your new computer.
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