I downloaded the JL_Cmder which I hear comes with javaloader.exe

I've successfully used JL_Cmder to wipe the handheld device in the past but I can't seem to get the javaloader.exe to work. I've located it in my C:/program files and when I double click it I see a quick flash of a black screen and that it.

Someone told me go to start/run then type in CMD and I should be able to use the commands to clear out the mp3 track and pictures that came preloaded with the Pearl but when I type in CMD then the command I get an error message all the time.

Can anyone provide me with instructions on how to do this so I can go ahead and delete more pre loaded media.