Download Java 2 runtime (Virtual Machine) and install it.

Sun Java 2 runtime - jre1_2_2-001-win.exe - (5MB)
After downloading the installer, double click it to install Sun's Java Runtime Environment (Virtual Machine) on your system. Or download it from Sun's Website

System 9.0 and 8.1 users - Install MRJ 2.2 from your MacOS 9.0 or 8.1 Install disk
Download MRJ 2.2 Full Installer - (MacBinary 4.7MB)
Download MRJ 2.2 Full Installer - (BinHex 6.4MB)
or download the latest version Apple's Website

System 8.0 & 7.6.1 users - Download MRJ 2.0 Full Installer - (11MB)
Note: You will need Disk Copy 6.1.3 to mount the MRJ Installer image.

System 7.5 & 7.6 users - Download PowerPC MRJ 2.0 Package - (9MB)

( and others )

Download the latest Java Runtime (Virtual Machine) for your system from Sun's Website and install it.