Sorry, your computer does not have Java enabled.
After the lawsuit between Microsoft and Netscape people
Microsoft decided not to deliver Windows XP with Java.
That's the bad news.
The good news is that you can download
the Java upgrade (or have someone do it for you).
Can you say, "This is a pain in the neck?"
Try this site to restore Jave to your computer...
Information regarding the Install,
use  of and uninstallation of the
Microsoft Java VM in Windows XP