what do you mean by "nero 6 drivers"? what drivers?
what dll files are you talking about ???
do you want to completely uninstall Nero 6 in order to install Nero 7?
if that's the case, uninstall Nero 6 using the control panel -> add/remove programs. after than run the Nero cleaning utilities (registry cleaner etc., don't remember the exact name) that can be downloaded from Nero's website.
that will completely clean up the system and leave it ready for Nero 7.
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