On my machine I show in the 'Add/Remove'

Java 2 Runtime Enviornment SE v 1.4.1 which is only 1.66mb

I also have Java (TM) SE Runtime Enviornment 6 Update 1 which is 159mb

I would think your client should have the most current [I think] Runtime version 6 Update 1 which is 159mb.

Everytime I download a newer version of Java it does not remove the prior version of 6 update x.... so I keep the most current version and delete the previous version.  You can update your java by going to

http://java.com

ONE ITEM... I keep 1.4.1 to run Panoweaver and Tourweaver.

Hope this helps