i would suggest uninstalling Nero 7, running the Clean Tools that can be found on Nero's website, and then reinstall Nero 7.
perhaps also a reboot between each step won't hurt (M$
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien