Java: JDK Installation for Microsoft Windows

Download Installer

The file jdk-7-windows-i586-i.exe is the JDK installer for 32-bit systems. The file jdk-7-windows-x64.exe is the JDK installer for 64-bit systems. If you downloaded either file instead of running it directly from the web site, double-click the installer's icon.

Follow the instructions the installer provides. The installer may ask you to reboot your computer.
**When finished with the installation, you can delete the downloaded file to recover disk space.

Read more; http://docs.oracle.com/javase/7/docs/webnotes/install/windows/jdk-installation-windows.html 

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