If you have downloaded and installed from http://java.com, but you are still not seeing the message, try this:
- Start Microsoft Internet Explorer.
- Click the Tools menu item.
- Select Internet Options ...
- Click the Advanced tab
- Scroll down until you see the Java (Sun) coffee cup.
- Click to put a check mark next to Use Java 2 ... for <applet> ...
- You may be required to restart your computer.