Launch4j error

Hello, I am getting a launch4j error ("An error occurred while starting the application"), when i try to start arduino0019, arduino0022, arduino0023, arduino1.0, it was working perfectly on this laptop , but now I am getting this error. After searching on the net, I tried : 1.Switching off bluetooth, wifii devices. 2.Re-installing arduino. 3.Opening arduino using a jar file. 4.Renaming arduino folder. Unfortunately, none of these seem to work, I am having this trouble only with arduino software, nothing else seems to be affected by it. PLEASE HELP.

Try deleting your preferences.txt file as suggested in this post: http://arduino.cc/forum/index.php/topic,95016.msg713750.html#msg713750

That was perfect..........thanks buddy..!!