Memory problems on Windows XP

I have recently installed Cygwin PostgreSQL using Windows XP. I have an 80 gb hard drive and 512 mb of RAM

I was able to successfully use Initdb, and seem to be able to start Postmaster, but when I try to use Createdb I keep getting the following message on the Server side:

bash-2.05b$ postmaster -D data -i
DEBUG: database system was interrupted at 2002-09-23 17:12:31 CST
DEBUG: checkpoint record is at 0/1135E8
DEBUG: redo record is at 0/1135E8; undo record is at 0/0; shutdown TRUE
DEBUG: next transaction id: 89; next oid: 16556
DEBUG: database system was not properly shut down; automatic recovery in progress
DEBUG: ReadRecord: record with zero length at 0/113628
DEBUG: redo is not required
DEBUG: database system is ready

DEBUG: server process (pid 220) exited with exit code 128
DEBUG: terminating any other active server processes
DEBUG: all server processes terminated; reinitializing shared memory and semaphores
IpcMemoryCreate: shmget(key=5432001, size=1441792, 03600) failed: Not enough core

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 1441792 bytes), reduce
PostgreSQL's shared_buffers parameter (currently 64) and/or its max_connections parameter (currently 32).

The PostgreSQL Administrator's Guide contains more information about shared memory configuration.

and

bash-2.05b$ createdb -h localhost testdb
psql: server closed the connection unexpectedly
This probably means the server terminated abnormally before or while processing the request.
createdb: database creation failed

on the client side.

I'm installed the following versions:

Cygwin 1.3.12-4
Postgresql 7.2.2-1.

I can't figure out how to resolve this.

George