How to check whether Java 2 Runtime Environment is installed

(These screen shots are taken under Windows 2000 Professional. For other Windows operation system such as Windows 98 or Windows ME, the layout would be similar but not exactly the same.)
  1. Open the windows control panel by:
    Click on Start Menu -> Settings -> Control Panel
  2. In the control panel window, double-click Add/Remove Programs
  3. In the program list, if there is an entry saying "Java 2 Runtime Environment ...", you should have it installed. Otherwise, your machine does not have Java 2 Runtime Environment installed or not installed properly.
  4. If you want to install/re-install Java 2 Runtime Environment, please follow the instructions in the Java 2 Runtime Environment Installation Guide.