Here is how you can install JAVA Eclipse on Windows 7

• Decide which version you want to use. If you are using 64-bit windows 7, you should install 64-bit JAVA JDK and JAVA Eclipse. If you are using 32-bit windows 7, you should install 32-bit JAVA JDK and 32-bit JAVA Eclipse.
• Download and install JAVA JDK from here.
• After JAVA JDK is download, install it as we normally install any software on Windows.
• Download JAVA Eclipse from here.
• After you have downloaded JAVA Eclipse, extract it using any zip software like winzip, winRaR. Do not use Windows default explorer to extract files, as it may not extract files properly. It will create a folder “eclipse”, with multiple subdirectories under that.
• JAVA Eclipse is installed now. Double click eclipse.exe to run JAVA eclipse

Important:
Both JAVA JDK and Eclipse should be of same bit (32 bits or 64-bits). if you install different bit-version, you can receive error message like:

A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be available in order to run Eclipse. No Java virtual machine was found after searching the following locations:

Failed to load JNI shared library “Program Files\Java\jdk1.6.0_20\jre\bin\client\jvm.dll”

Only solution for such error message is, install same bit version of JAVA JDK and Eclipse. No need to change any environment variables path in Windows 7.