The Windows 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.
Note: Only PostgreSQL 8.2 and above are supported on Windows.
The one click installer is designed to be as straightforward as possible and the fastest way to get up and running with PostgreSQL on Windows.
Advanced users can also download a zip archive of the binaries, without the installer.
The one click installer is maintained by Dave Page at EnterpriseDB.
pgInstaller is a Windows Installer package that offers advanced configuration options. pgInstaller packages are only being maintained for PostgreSQL 8.2 and 8.3.
pgInstaller is maintained by Dave Page and Magnus Hagander.