Pls. Help with finding Main Class

[DetRich]

Hello,

I've been given a java program which I must use on a regular basis.
The program is named jcoe.jar and was working fine. There was no installation, just copy everything to the root of the c: drive and double-click on the .jar file.
I copied the entire directory structure to the network and had my workstation re-staged. I then copied it all back down to the same location. Now, when I run the program, I get the following error message:
Title Bar: "Java Virtual Machine Launcher"
Error Msg: "Cold not find the main class. Program will exit."

I've seen others have had this same issue but I've not seen a solution.
Can anyone explain this to me? I'm not a developer so I don't know the ins & outs of java. I'm running Java Runtime Environment, Standard Edition 1.4.2_07.

Thanks in advance,
DetRich

[DetRich]

From a command prompt, I navigate to the C:\Program Files\Java\j2re1.4.2_07\bin folder and run "java <path to my program> and get the message:
"Exception in thread "main" java.lang.NoClassDefFoundError: C:\DatapowerDeployment\bin\j2eebuildgui/jar"

DetRich