There are two installers for Windows available, aimed at different users. Both contain the same software, including 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.
The one click installer is maintained by Dave Page at EnterpriseDB.
pgInstaller is an Windows Installer package that offers advanced configuration options and the ability to be easily embedded in other installers. As an MSI package, it is also ideally suited for deployment across a network using Group Policy.
pgInstaller is maintained by Dave Page and Magnus Hagander.