The information on this page is intended for users of a 64-bit Windows operating system.
You can check if you are running 64-bit Windows before downloading 64-bit Java for Windows using the following link.
64-bit Windows operating systems (such as Windows 7, Vista or XP) come with a 32-bit Internet Explorer (IE) browser as the standard (default) for viewing web pages. These operating systems also include a 64-bit Internet Explorer browser, however using it is optional and it must be explicitly selected to view web pages. Note that because some web content may not work properly in a 64-bit browser, we recommend using the default 32-bit browser and downloading 32-bit Java.
Follow the steps to verify whether you are using a 32-bit or 64-bit browser.
If you are running 64-bit Firefox, it may be indicated as 64-bit (e.g., Win64), otherwise it is a 32-bit version of Firefox.
64-bit Java is presented as a download option automatically for 64-bit Internet Explorer and 64-bit Firefox. Switch to the 64-bit browser to access the 64-bit download.
Users should download 32-bit Java software, if they are using 32-bit browser on their 64-bit Windows. For downloading and installing 32-bit Java on your system
Users should download 64-bit Java software, if they are running 64-bit browsers. From a 64-bit browser, download 64-bit Java from the manual page.
Online Installation and Java Update features are not available for 64-bit Java 7. You will not see an Update tab in the Java Control Panel. You can manually update Java 7 on 64-bit Windows by running the latest Java 7 64-bit offline installer.
Starting with Java 8 Update 20, the Update tab in the Java Control Panel enables users to automatically update 64-bit JREs (in addition to 32-bit versions) that are installed on their system.
For more information refer Microsoft 32-bit-and-64-bit-Windows- FAQs
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