Is there a way to prohibit use of Administrator on workstations?

Administrator is essentially a tool for managing the SQL Server database engine. It is installed on workstations because it is needed for system setup and administration. Once the database connection and configuration has been completed, you should not need to use this tool unless the system needs to be reconfigured, or you need to run SQL scripts. You can remove the Administrator shortcut from your workstations once the system has been properly setup.