I'm not sure if it'll help at all, but see whether any advice here makes a difference: Java Runtime Environment (JRE) - Java programs freeze my computer

Are you having any problems or error messages during your Java installations?
You can verify your Java installation at this page: Download Java software for Windows from Sun Microsystems

Unless someone else has a better idea, I'd suggest asking at the Java forum. Try this section: Runtime Environment
Even though it says 'developer forum', you might get some answers there & I really don't know where else to send you