Hi and welcome.
You shouldn't run Launchbox as a administrator, it can effect launching programs as they then need elevation.
The steam importer is unfortunately currently not working, it is being looked into.
The windows game importer scans your windows start menu for games, if they aren't in there they wont be picked up by the importer. It is very easy to add manually though, just drag a .exe or a shortcut onto the Launchbow window, this will start the import wizard, select the "none of the above" option to import standard .exe's that don't require a emulator to run.