BUG #6164: Flashing dialog

The following bug has been logged online:

Bug reference: 6164
Logged by: Kyle Fox
Email address: kyle(dot)fox(at)gmail(dot)com
PostgreSQL version: 9.0
Operating system: Mac OSX 10.6.8
Description: Flashing dialog
Details:

I used the installer to install Postgres 9.0 on my Mac, and now every 10
seconds a dialog message flashes and immediately disappears, and STEALS
FOCUS.

My computer is completely unusable because of the installer. How do I fix
this? I would like to uninstall postgres entirely.

Here's the output from the Console.app:

11-08-15 9:24:04 PM Firewall[63] postgres is listening from 0.0.0.0:5432
proto=6
11-08-15 9:24:04 PM com.edb.launchd.postgresql-8.4[426] 2011-08-15 21:24:04
MDT FATAL: could not create shared memory segment: Cannot allocate memory
11-08-15 9:24:04 PM com.edb.launchd.postgresql-8.4[426] 2011-08-15 21:24:04
MDT DETAIL: Failed system call was shmget(key=5432001, size=32587776,
03600).
11-08-15 9:24:04 PM com.edb.launchd.postgresql-8.4[426] 2011-08-15 21:24:04
MDT HINT: This error usually means that PostgreSQL's request for a shared
memory segment exceeded available memory or swap space. To reduce the
request size (currently 32587776 bytes), reduce PostgreSQL's shared_buffers
parameter (currently 3584) and/or its max_connections parameter (currently
103).
11-08-15 9:24:04 PM com.edb.launchd.postgresql-8.4[426] The
PostgreSQL documentation contains more information about shared memory
configuration.
11-08-15 9:24:04 PM Firewall[63] postgres is listening from :::5432 proto=6
11-08-15 9:24:04
PM com.apple.launchd[1] (com.edb.launchd.postgresql-8.4[426]) Exited with
exit code: 1
11-08-15 9:24:04 PM com.apple.launchd[1] (com.edb.launchd.postgresql-8.4)
Throttling respawn: Will start in 10 seconds