Postgre installation issue

We are trying to switch from Oracle 10g to Postgre but I am having few
technical issues which I am listing here and I hope someone can help.

Server Status:

- I am installing "postgresql-9.0.2-1-windows.exe" package on
Windows Server 2003 SP2 with 2 LAN Cards

- The server is part of a domain and I am installing using the
Administrator login

- Before installation we have removed completely the AV software

Installation:

- We have chose the following directories during installation:
D:\PostgreSQL\9.0

D:\PostgreSQL\9.0\data

- The PG user was created in the domain users with a pw that was
accepted

- During installation, The locale is English, United States and not
to [Default locale]

- During installation, starting the database server, this error
shows

Warning: Problem running post-install step. Installation may not complete
correctly
Failed to start the database server.

I clicked OK and continue

- After installation completion, the service "postgresql-9.0 -
PostgreSQL Server 9.0" will fail. It is setup to start Automatically
Services: could not start the postgresql-9.0 service on Local Computer.

Error 1069: The service did not start due to a login failure.

- When checking the service login, I found out the user to be
.\postgres so browse for it in the domain and changed it to
DOMAIN_NAME\postgres, re-start the service it worked

Configuration Problems:

1. In postgresql.conf file when I changed the listen address to one of
my LAN card to channel all traffic through it by doing: listen_addresses =
'192.168.1.212' instead of listen_addresses = '*', re-starting the service
will not work, changing the entry back and re-starting the service will not
work, changing the entry back and re-start the whole server will work and
the service will start

2. In pg_hba.conf I have the following entries:
host all all
127.0.0.1/32 md5

host all all
192.168.1.211/32 md5

host all all
192.168.1.212/32 md5

host all all
192.168.1.4/32 md5

using PGAdmin from the server itself, I created 2 New login Role "1" and "2"
, 2 Tablespace "1" and "2" as this
D:\tablespace\1

D:\tablespace\2

which is next to the PG directory D:\PostgreSQL

and had to gave permission to the user: DOMAIN_NAME\postgres to
D:\tablespace directory

then created the database "1" and "2" with the prospective user as owner and
the tablespace

Logging from the remote machine with IP: 192.168.1.4 using the user 1, I can
see both 1 and 2 dbs

however when I changed the pg_hba.conf to

host 1 all
192.168.1.4/32 md5

restarting the service, I can't login at all. This entry does not work

however; these entries will work:

host all all
192.168.1.4/32 md5

host all 1
192.168.1.4/32 md5

But still can see all the dbs

I need to have each user sees its own DB, how can I do that

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