I would say better to re-install.
When installing, a registry entry is created for the Content, this is used to find the files of course.
If you always enter the same path, all sound files should cleanly reside in the same folder.
For me, that would be F:\Audio Libraries\Steinberg, without entering the “VST Sound” folder in the path, as this would create another sub-folder.
You could also try and move the Content, but we generally do not recommend it.
If you feel like doing it, you might check the registry entry for the Content (HKEY_CURRENT_USER -> Software -> Steinberg) and move the files which are not there already accordingly.
The entries you have in the Control Panel are HALion Sonic SE program, HALion Sonic SE 64 bit program and the Content respectively. Those can be uninstalled / installed separately.
Lastly, the same entry applies to the other Content as well (REVerence, Groove Agent, etc.), so the best way to have everything in the same folder is to install everything, including Cubase, using one path and making sure to always use that one for the following installations.
Hope this helps, I understand it can be a little tricky.