Java APIs

I'm using BlueJ 2.0.5 with Java 1.5.0 Update 4 and when I try to create an object from the BlueJ CD examples folder, the program says "Creating object...", but doesn't create the object and the "Creating object..." only disappears if I click somewhere in the screen.

I also found an error message of some kind in the debugger. I found the following:
"Listening for transport dt_socket at address: 2579"

and

"java.lang.NullPointerException
at bluej.runtime.ExecServer$3.run(ExecServer.java:786)
ERROR: transport error 202: recv error: Software caused connection abort ["transport.c",L41]
ERROR: transport error 202: send failed: Software caused connection abort ["transport.c",L41]"

Does anyone have any idea what is up here? BlueJ v2.0.1/3 and an older version of Java 1.5.0 work fine on my laptop. I intend to update both the Java and BlueJ on my laptop to see if it is the program or Java.

Is is possible that Java or BlueJ are clashing with my firewall or antivirus? ZoneAlarm free & latest version, Avast free & latest version respectively? I suspect not as I use ZoneAlarm and Avast on my laptop as well as on my PC.

BlueJ used to work fine when I had XP Home SP2 on a PATA drive, I've now upgraded to XP Pro SP2 on a SATA drive, but I can't see how a different HDD or OS could cause this problem?

I'm going to email my Uni lecturers and see if they have any idea as well as google some more. I'll also post on the BlueJ forums, in case it is a BlueJ error and not a Java one.

Thanks.