Installation Problems III?

I installed 2 Operation System in the same partition before. But now, I have been followed the steps right click on my computer > go to Advance tab > go click setting on Startup and Recovery section > click edit on system start up section...deleted 1 of them and will not ask me to choose either 1 or 2 OS when start up my workstation.
However, both of the old windows and user folders still in “C” and couldn’t delete even start with the save mode and login as an Administrator.