After uninstalling, Symantec is still detected

I am very frustrated.  I am trying to install a newer version of Norton and it's telling me that I have to remove my older version.  I uninstalled from the Control Panel Programs list.  I also went to the program files and was able to delete most Symantec files.  It would not allow me to delete some because I said I "need permission" and it didn't let me delete all files.  I tried to download the Norton tool that finds all Norton versions and erases them but it would not let me download because it keeps saying its detecting Norton 9 or higher.  I have Vista and have tried everything.  Symantec is no longer listed in my programs under the Control Panel.  How the heck can I get rid of everything associated with the old so I can start fresh with the new.  Please help!!