Move folders and remain source folder structure

In Windows Vista (I have Home Premium) when we move a folder to another that
has some sub folders or files with the same name, appears a dialog box asking
if you want to replace, etc. But even if I choose to replace all, it remais
the folder struvture, empty (it moved the files to destination), in the
folder I just moved, and I have always to delete that folder structure in the
end. Is this normal, a bug or do you know some option I can switch to move
all the stuff and delete the source folder structure? Thanks