You probably still have clutter in your registry associated with creator 2009. If you uninstalled creator with the standard windows add/remove programs, then you didnt get rid of everything. For more complete uninstalls and the subsequent registry clutter cleanup, try revo uninstaller, its free and does a much better job than the windows add/remove programs. Also completely uninstall emc7 as well. Once you have done all of that fire up registry editor and search through for any other clutter associated with either prog, but be careful, only delete keys specifically associated with creator 2009, emc7, and roxio. After you have done all of that then reinstall emc 7, and try to register it again with your key. If it still doesnt work, then your key might have been invalidated, in which case you will have to contact roxio customer service.