I ran into this exact same problem and think I was able to fix it. First go through the Dell troubleshooter: http://tinyurl.com/3a2hbv
Follow the flowchart, and make sure to select the choice of optical drive can not read disk. Now eventually you should get to a recommendation of removing the upper and lower registers. This actually fixed the problem for me. BUT let me caution you that this could affect other cd/dvd programs on your computer.
What I did was before I removed the entries from my registry, I exported them so I had a backup copy. Then I removed them, rebooted my computer, and now I could read my cd-r disk. I discovered my other programs weren't working so I double clicked the registration keys I exported to add them back. Rebooted. And now I can read my cd-r and my other programs work too.