I have the latest 64 bit version of PostgreSQL. I am running Win 7 64 bit. I had installed the ODBC driver (via the initial installer) when I installed PG, and upgraded it to the latest version from http://www.postgresql.org/ftp/odbc/versions/msi/.
However, when I go to the ODBC control panel and try to add a User DSN, PostgreSQL isn't listed as a server.
I was following the instructions given here, but I noted the links are dated.
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postgresql
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As I see PostgreSQL installer doesn't include 64 bit version of ODBC driver, which is necessary in your case. Download psqlodbc_09_00_0310-x64.zip and install it instead. I checked that on Win 7 64 bit and PostgreSQL 9.0.4 64 bit and it looks ok:
Test connection:
Please note that you must install the driver for the version of your software client(MS access) not the version of the OS. that's mean that if your MS Access is a 32-bits version,you must install a 32-bit odbc driver. regards
Installing psqlODBC on 64bit Windows
Though you can install 32 bit ODBC drivers on Win X64 as usual, you can't configure 32-bit DSNs via ordinary control panel or ODBC datasource administrator.
How to configure 32 bit ODBC drivers on Win x64
Configure ODBC DSN from %SystemRoot%\syswow64\odbcad32.exe
%SystemRoot%\syswow64\odbcad32.exe
You may have to play with it and try different scenarios, think outside-the-box, remember this is open source.
First you download ODBC driver psqlodbc_09_01_0200-x64.zip then you installed it.After that go to START->Program->Administrative tools then you select Data Source ODBC then you double click on the same after that you select PostgreSQL 30 then you select configure then you provide proper details such as db name user Id host name password of the same database in this way you will configured your DSN connection.After That you will check SSL should be allow .
Then you go on next tab system DSN then you select ADD tabthen select postgreSQL_ANSI_64X ODBC after you that you have created PostgreSQL ODBC connection.
Source: Stackoverflow.com