Installing PostGIS - no "Spatial Extensions" in stackbuilder 2.1.0

[Mike_Green]

I am trying to intall PostGIS, but there is no "Spatial Extensions"  option in stackbuilder 2.1.0 for PostgreSQL 8.4

The optins in stackbuilder are as follows
Catagories

    Add -Ons
    Database drivers
     Web Applications
     Web Development

I am referring to the tutorial Installing & Setting Up PostgreSQL With PostGIS
I have stopped at PostGIS 4.
What can I do to install PostGIS?

[Indrid Cold]

Try installing postgresql-8.3.5-1 and you will have the extensions as outlined in the tutorial.

[Mike_Green]

I have installed 8.3.5 as suggested, and that seemed to work as far as the spatial extensions goes,
but now when attempting to start the instilation of postgis 1.3.5 for PostgreSQL  8.3 v 1.3.6 or v1.3.5 (the only two options under spatial extensions) I have an error that reads"

createdb: could not connect to database postgres: could not connect to server: Connection refused (0x0000274D/10061)
   Is the server running on host "localhost" and accepting
   TCP/IP connections on port 5432?

In view settings

Creating template database...
ExecShell: open C:\DOCUME~1\MICHAE~1\LOCALS~1\Temp\postgis_installer\create_templatepostgis_db_error.txt
Database creation failed.
Database creation failed.


Any suggestions would be appreciated