Invalid Java archive

[Guest splinter98]

I have decided to post a link here for my problem (as i was getting no responce)

http://www.modaco.com/Invalid-Java-Archive-t244868.html

Basiclly I am having problems installing any Java apps and when i try i get 'Invalid Java archive (jar)' error thrown at me.

I have tried several options so any help will be very much appreciated

Splinter98