BUG #2958: ERROR: 53200: out of memory

The following bug has been logged online:

Bug reference:      2958
Logged by:          Anton Andreev
Email address:      fn30762@fmi.uni-sofia.bg
PostgreSQL version: 8.2
Operating system:   Windows Server 2003 32bit
Description:        ERROR: 53200: out of memory
Details:

I have this error and some other odd behavior as the postgresql does not
want to start without restart of the machine. I am using a Virtual Private
Server with 320MB RAM, but I do not think the memory is the problem.

Someone suggested that this might help:
SET enable_hashagg = false;
Should I use it?

This problem dates from version 7.4???