ODBC from MS Access

I'm fairly new to PG. I'm working on implementing Project-Open, "PO", for
a non-profit organization; I am a volunteer.
I need to migrate legacy data from MS Access to the PO database (PG) - I'm
hoping that I can use Access as the front-end for the migration procedures.

FYI, I am running Access 2007.

I've read some of the PG documentation.

checked and confirmed that:

posgreSQL.conf contains listen_addresses='*'.

Added a line to pg_hba.conf containing:

host all all myIPaddress trust

.using 'postgres' or 'projop' for the database name.

.using 'postgres' as the username; no password

Getting an error message: 'No connection could be made because the target
machine actively refused it.'

Looking for clues in pgAdmin III -- would be glad to get a little help
from you.

Regards,

JPD