You will need to choose the manual mode when partitioning and install Debian onto the target partition. The default /, swap, /home scheme is the easiest to use. The boot-loader is the last step of the installation. I have never dual-booted with Windows, so must leave advice in this area to someone else.
Last edited by Randicus Draco Albus; 08-10-2014 at 05:03 AM.