Hi Andy Hendriks:
Thanks for posting.
The admin console can have issues launching if the wrong Java version is being run. The first thing you need to try is updating to Java 1.6.27 on your Windows 2003 Server. You can go to http://www.java.com/en/download/index.jsp to download the latest Java runtime version. After you have run this update, reboot your server. Once the server is back up, open a web browser and go to http://localhost:16000. This address should open a page with a prompt to launch the admin console. Let me know if updating to the latest Java version helps.