Launch4j error

Hi,

Just downloaded version 0021 onto win7 32-bit machine and when I try to open the IDE I get the following error messages:

Launch4j
An error occured while starting the application
Invalid window handle

and then:

Launch4j
An error occured while starting the application

From what I've read, this appears to be a Java error but I don't know enough to begin troubleshooting :-[ Any pointers would be appreciated