Henry.jl

Hi, Ccleaner is completely safe right? I don't really understand how to use this program... When I run it it has Internet Explorer, Windows Explorer, and System ticked. What I'm trying to say is does this ccleaner delete folders? Like folder that is empty located in C: drive etc? I've got all those things ticked except for 'Advance' what happens if I run the cleaner and it stuffs up my computer? Can I do a system restore? Thanks, Henry