Java runtime error messages

Java Runtime error messages
I am getting 2 error messages:
“Java(TM) Plug-in Fatal Error
Several Java Virtual Machines running in the same process caused an error.”

and

“Java(TM)Plug-in Fatal ERror
the Java Runtime Environment cannot be loaded.”

i have unloaded all of the Java software and reinstalled Java 6 update 3 and i am still getting these error messages.

What do i need to do to get rid of these messages?

I am using Windows XP SP2
Thanks