Ok I got it.
You want to hide Objects(Db design window--tables,reports,queries,formsetc)and VB code also.
So
1.Make sure you have Backup of your mdb file.
2.Compile your Data. For this go in the design view of any form, from menu bar View tab---view code----Debug tab---Compile Db.
3.Go tools---Startup----uncheck Display Db window,better to uncheck all.
And set in Startup option your Startup form.
feel free to ask any question.