First thing I would do would be to run the Microsoft Fix It tool for optical drives. You can find a link to their site in my signature.
Next, I would uninstall Nero, download the Nero clean tool from their site for whichever version of Nero that you have, then run that. If you must reinstall Nero, do NOT install INCD unless you have an overwhelming need for the program.
Nero and Sonic used to cause problems in the past when installed on the same system. Don't know if that is still the case.