For some reason Java will not work on my Mac (any of my Macs for that matter)

I have the latest software update but if I go to java.com and hit "Do I have Java?" it tells me to download the newest version from Apple. I do this but when I try to install it tells me that there is a newer version already installed on my machine. Wth??



Any ideas? I have tried at work and at home and exactly the same issue.

Thanks