Under system tools-->services, there is a list of all the services that are installed and lists which ones get started on boot. On my system I have wu-ftp installed, but it doesn't start. It does, however, require that xinetd also be running, so that might be your problem. You can selectively start services with this gui, as well as same them to be started again on next boot. See if that helps move you along.
If the install of wu-ftp the only RPM that fails to install, or is it all RPMs. There is a known issue many have encountered
then navigate to 'RPMS stop working'