psycopg2-2.0.6.win32 failure in py2exe installation

Python: 2.5.1
psycopg2: 2.0.6.win32
PostgreSQL: 8.3.1

I have created an installer for my app using Inno Setup. It installs my
app created with py2exe then launches the installer for PostgreSQL. So,
I have my app installed on a user's machine with PostgreSQL in
C:\PostreSQL\. I have add the PostgreSQL path to the system PATH.
However, when I run the app I get these errors in the log:

Traceback (most recent call last):
  File "test192cfm.py", line 11, in <module>
  File "getpgcursor.pyo", line 3, in <module>
  File "psycopg2\__init__.pyo", line 60, in <module>
  File "psycopg2\_psycopg.pyo", line 12, in <module>
  File "psycopg2\_psycopg.pyo", line 10, in __load
ImportError: DLL load failed: The specified procedure could not be
found.

Now, on my development machine, everything works fine. However, I have
installed all the dependencies manually (Python, psycopg2, etc.).

I found a possible solution in a post from 2005, which points to:

http://initd.org/tracker/psycopg/ticket/32

Unfortunately, that part of the site is not working right now.

Any ideas on what I'm doing wrong here?

Thanks,
Tom