Hi Fluffydoe and Can you tell us which version of Norton's you are trying to load? Is it 2004 or an earlier one? Some people have had problems with the 2004 version. Are you trying to re-install it after a previous installation? Or on top of another installation?
Yes, you need to uninstall any previous versions of Norton, before installing a newer one. Do you have another anti-virus program already installed (other than Norton)? You would need to uninstall that too.