BUG #8197: Error Message When trying to install PS8.1

The following bug has been logged on the website:

Bug reference: 8197
Logged by: Rob Mapletoft
Email address: healthycomputers(at)persona(dot)ca
PostgreSQL version: Unsupported/Unknown
Operating system: SBS 2011 64 bit
Description:

The files belonging to this database system will be owned by user
"postgres".
This user must also own the server process.

The database cluster will be initialized with locale C.

fixing permissions on existing directory C:/Program Files
(x86)/PostgreSQL/8.1/data ... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/global ... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/pg_xlog ...
ok
creating directory C:/Program Files
(x86)/PostgreSQL/8.1/data/pg_xlog/archive_status ... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/pg_clog ...
ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/pg_subtrans
... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/pg_twophase
... ok
creating directory C:/Program Files
(x86)/PostgreSQL/8.1/data/pg_multixact/members ... ok
creating directory C:/Program Files
(x86)/PostgreSQL/8.1/data/pg_multixact/offsets ... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/base ... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/base/1 ... ok
creating directory C:/Program Files (x86)/PostgreSQL/8.1/data/pg_tblspc ...
ok
selecting default max_connections ... 10
selecting default shared_buffers ... 50
creating configuration files ... ok
creating template1 database in C:/Program Files
(x86)/PostgreSQL/8.1/data/base/1 ... Execution of PostgreSQL by a user with
administrative permissions is not
permitted.
The server must be started under an unprivileged user ID to prevent
possible system security compromises. See the documentation for
more information on how to properly start the server.
child process was terminated by signal 1
initdb: removing contents of data directory "C:/Program Files
(x86)/PostgreSQL/8.1/data"

Failed to run initdb: 1!
Please see logfile in C:\Program files (x86)\PostgreSQL\8.1\tmp\initdb.log
Note! you must read/copy this logfile before you click OK, or it will be
automatically removed.