I had an existing installation of Eclipse 3.0. I followed the steps in the link to JBoss IDE article (link pasted below) to install the Jboss plugin.
Link: http://www.devx.com/opensource/Article/20242
I followed the steps for adding the shortcuts and configured the server.
My problem is that when I try to start the server...Default Server -> Start,
or use the short cut to start the server, it throws the following error...

Java Application Launcher
Could not find the main class. Program will exit.

and " Error Cannot connet to VM"

In the console the error is
java.lang.NoClassDefFoundError: Files\jboss-4/0/3
Exception in thread "main"

If I use "run.bat" from the command line, the server starts off fine though.

I am running Windows XP Professional, and it did ask me both times if I wanted to unblock the program. I might have clicked on "keep blocking" by mistake for the first option.....and this might be the reason for the error. This occurs even if I turn the Windows firewall off.
If so please let me know how to fix this.

Thanks in advance.