Now what? There seems to be a few items in the App folder, but they act only as orphaned aliases. Just start over? Also..., the very nice sales lady said it was not necessary to de-install CS3. There seems to be Adobe stuff all over my HD. Do I need to de-install?
You do not have to de-install CS3. You can start the CS5 install again. You can remove the old vestiges of the CS5 install or remove them. If you are fearfull you can run the CS Cleanscript to remove all vestiges of all versions, but it should be unnecessary.