I have problems starting up LimeWire. Nothing happens.

I have installed the program without any reported errors. When I try to start up the program from the shortcut on my desktop _nothing_ happens. I have tried re-installing LimeWire but it doesn´t make any difference. Please help me!

About a week ago I had some major problems with LW 1.4 (?), the previous version. I unstalled it and installed the new version 1.6. It was able to run for about a day but then crashed with the problems mentioned above. Back then I received an error message saying "java.lang.ClassNotFoundExceptoin:uaab.Main".

What might be wrong?