What version of Nero are you using?
depending on which version, you may have 2 different exe files, you need the one called "startsmart" or something like that, the erase function is on that.
It would help to know which one you have though, because they are different.
The Nero on my Wife's computer is a different one to mine and works slightly differently.

Injustice will be avenged.
Cofiwch Dryweryn.