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If you have NB installed ant want to re-install it the procedure is that you have to de-install it first and then re-install it. I.e. the installer blocks you right now from re-installing NB if it is already installed in a certain directory. Instead there should be a question asking whether the user wants to re-install NB if it finds a previuos installation. As an example for this, the installer of the JDK 6 development builds.
*** This issue has been marked as a duplicate of 66965 ***