Designer Error at Launch

Hi,
I am unable to launch Designer, as it throws up a java related error:

the error is: Error Launching Application: NoClassDefFoundError: javax/swing/AbstractButton$ButtonActionPropertyChangeListner

I have Ignition and jdk/jre installed in the same program files(x86) folder
The image is attached herewith.
[attachment=0]designer launch error.jpg[/attachment]

Pls help

Gokhale