[ADMIN] Configure DB

Hi List,
I'm working with Postgres,  I'm  storing spatial information, but I have any problems when I try to acces to my data..from php, visual basic and postgis too...

This is the message error:

Warning: pg_connect() [function.pg-connect]: Unable to connect to PostgreSQL server: could not connect to server: Connection refused (0x0000274D/10061) Is the server running on host "???" and accepting TCP/IP connections on port 5432? in C:\Program Files\ms4w\Apache\htdocs\conexion.php on line 4

I read that I need to configure these files:
pg_hba.conf
postgresql.conf


I hope your help..
Thanks...