Failed to load sql modules into the database cluster during PostgreSQL Installation

Question

I have attempted to install PostgreSQL 9.4 and 8.4 multiple times and it is failing no matter what I have tried. I am attempting to install on Windows 7 SP1 x64. After each

Answer 1

I was getting this same error when trying to install PostgreSQL v9.4.4 on Windows 10 Pro. Starting with a solution hosted on Stack Exchange, I came up with the following steps that allowed the installer to run successfully:

1) Create a new user account, called postgres
2) Add the new account to the Administrators and Power Users groups
3) Restart the computer
    NOTE: I added step #3, since step #4 didn't work without it
4) Run a command prompt as the postgres user, using the command:
    runas /user:postgres cmd.exe
5) Run the installer from the postgres command window
6) Delete the postgres user account, as well as the user directory
    NOTE: I added step #6, since the postgres account is not required after installation