While trying to install the FM 4.2, on Windows, with the express option, at the database options screen it gives me a message as, 'There is already an instance of PostgreSQL installed on your system. Please go back and proceed with the existing database', if I say 'ok', to this and go back to do a custom install and say use existing database with Postgresql selected, it says, 'Unable to connect to the database. Please go back and check your settings. Cannot connect to jdbc:postgresql://localhost:5432/dcmdb with admin.'. Thus I am unable to install it, looks like I had a incomplete install earlier. Now I tried removing postgresql by deleting the folders from the c:/program files as I was not getting any option to uninstall it, but the error still comes looks like the Postgre isn't getting uninstalled. How do I get rid of this postgresql and then do a complete install of FM?