The Java Runtime Environment is the layer that allows your computer to run applications written in the Java programming language. Even if you have a 64-bit version of Windows 7, you might still need the 32-bit JRE if:

Click "Install." The installer will download necessary files and configure your system.

Many older accounting, banking, or engineering programs were built specifically for the x86 architecture.

Ensure your security software is active, as Java is a common vector for web-based exploits on older systems. Troubleshooting Common Issues

If you'd like to for Java or need help troubleshooting a specific error code during installation, let me know!