Problem with Java application?

[Dialga da diamond]

I have a problem with an application I'm trying to install.
When i click on install it comes up with a message saying:

Exception in thread "main" java.lang.NoClassDefFoundError: Install

Can you please tell me how to fix this problem i have downloaded the latest version of java too. Should i remove java entirely from my computer and re-download it in case something got corrupted while it was downloading.

I really need to fix this problem!! 10 points to whoever tells me how to fix this problem!!

[Colin R]

delete all of the java app. that you can find then redownload it one more time...if that dose not work e-mail me.