The graphical installer for PostgreSQL includes the PostgreSQL server, pgAdmin III; a graphical tool for managing and developing your databases, and StackBuilder; a package manager that can be used to download and install additional PostgreSQL applications and drivers.
The installer is designed to be as straightforward as possible and the fastest way to get up and running with PostgreSQL on Windows.
Download the installer from EnterpriseDB for all supported versions.
Advanced users can also download a zip archive of the binaries, without the installer. This is not recommended for normal installations, it is intended for users who wish to include PostgreSQL as part of another application installer.