[Pljava-dev] Failed to create Java VM, WinXP

I am trying to get pljava set up on my Windows XP machine.

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I am running
"PostgreSQL 9.0beta4, compiled by Visual C++ build 1500, 32-bit"

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I downloaded: pljava-i686-pc-mingw32-pg9.0-1.4.2.tar.gz

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I made these changes to postgresql.conf . . .

custom_variable_classes = 'pljava'
pljava.classpath = 'C:\\Program Files\\PostgreSQL\\9.0\\lib\\pljava.jar'

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I replaced the files "pljava.dll" and "pljava.jar",
which were in C:\Program Files\PostgreSQL\9.0\lib,
with the files in the pljava download.

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I added the following entries to the PATH var:

set PATH=%PATH%;C:\Program Files\Java\jre6\bin;C:\Program Files\Java\jre6\bin\client

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I restarted my laptop.

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I applied "install.sql" to the db, using psql.
and saw:
CREATE SCHEMA
GRANT
CREATE FUNCTION
CREATE LANGUAGE
. . .
CREATE FUNCTION
CREATE FUNCTION
CREATE FUNCTION
CREATE FUNCTION

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I did

CREATE or Replace FUNCTION getsysprop(VARCHAR)
RETURNS VARCHAR
AS 'java.lang.System.getProperty'
LANGUAGE java;

This worked, it created the function in the "public" schema.

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But when I ran this:
SELECT getsysprop('user.home');
I got:
ERROR: Failed to create Java VM

Can somebody help me troubleshoot my failed attempt at installing ?
Thanks.