Norton Ghost install fails

I am trying to reinstall Norton Ghost 15.  However, the install fails.  I get "NG15 ...is already installed...uninstall NG15".  NG does NOT appear in the W7 ADD-Remove programs list nor in Revo Unistaller.  There's no icon on the desktop, no listing in All Programs in the Start Menu.  It's not in C:\Program Files x86 or C:\Program Files and a search using the  W7 search engine produces no hits for Norton Ghost.  I'm installing from D: to C: from a downloaded NG15 so there's no cd.  Has anyone encountered this before and if so what's the fix?  I have Norton Utilities 14 installed.