How to install Java on a Windows computer

General Information

When installing or updating the Java platform on your computer, it's recommended that that you maintain a single version (i.e, the latest) as multiple versions may adversely impact the operation of the TWS.  In this article we will first describe how to uninstall those Java platforms which might already reside on your computer and then how to install the latest Java Runtime Environment.


Section A - Remove all previous Java versions that might be installed on your PC:

  1. Click on the Start menu.
  2. Click on Control Panel.

 

  1. Set the "View By" selector to "Category".
  2. Click on "Uninstall a program". On Windows XP this feature is called "Add or remove programs".

 

  1. Find the first Java entry in the Installed Programs list
  2. Click on "Uninstall".  On Windows XP you need first to select the Java item from the list and then click on the button "Remove" which will appear on the right side of the selection box. If no Java items are listed, please skip steps from 6 to 11 and proceed directly to section B).

 

  1. You may now receive a message asking you to confirm your intention to uninstall the software. Confirm by clicking on OK.

 

  1. You may now receive a User Account Control warning message. In case your user has the required privileges, just confirm by clicking 'Yes' (8b). If you are logged in Windows with an user which does not have the privileges to install software, you will see in the same window, but as well the fields (8a) in which to enter the credentials of another user which has those privileges (usually 'Administrator'). Please enter the required credentials and then confirm with 'Yes' (8b)

 

  1. The uninstall process will start. Java will be uninstalled and the related entry eventually removed from the Installed Programs list.
  2. Uninstall all the other Java platforms which may be present on the Installed Programs list. Uninstall them one after each other, repeating the steps from 5 to 9 up to the point when you will not see any more Java item listed among the Installed Programs.
  3. Restart your computer. This Step MUST be performed in order to clean up completely the system from the old Java files and registry entries which might have been in use during the uninstall process.

 


Section B - Install the newest version of the Java Runtime Environment:

In this tutorial we describe the installation using Internet Explorer which is the browser installed by default on every Windows computer. If you prefer to use another browser (such as: Mozilla Firefox, Opera, Google Chrome, Safari) please take into account that the disposition and/or the content of the messages appearing during the first 10 steps might slightly differ.

 

  1. Open the Internet Explorer Browser and type "http://www.oracle.com/technetwork/java/javase/downloads/index.html" in the address bar. Then press the "Enter" key on your keyboard. The page will load.

 

  1. In the first section on this page - "Java Platform, Standard Edition", locate the blue "Download" button under the title "JRE". At the time the screenshots below have been done, latest release is 7u45. You might currently find other version number on this page. This does not represent an issue, since the page should provide only the latest release available, the one we need to install.

 

  1. Click on the radio button next to "Accept the License Agreement "
  2. Download the file correspondent to "Windows x86 Offline" which is the installer for the  32-bit JRE.

 

  1. Choose "Run". The download will start.

 

  1. Once finished you may receive a User Account Control warning message. In case your user has the required privileges, just confirm by clicking 'Yes' (6b). If you are logged in Windows with an user which does not have the privileges to install software, you will see in the same window, but as well the field (6a) where you should enter the credentials of another user which has those privileges (usually 'Administrator'). Please enter the required information and then confirm with 'Yes' (6b)

During this phase you might receive as well additional warning message/s from your Antivirus or Internet Security System asking you to confirm your intention to open/execute the file or to confirm that it is safe to open the file. After having checked that the file which is supposed to be executed is indeed the one you downloaded from the Oracle Web Site, answer positively.

 

  1. Proceed with the 32-bit JRE Java installation, using the default parameters, by clicking on the button "Install". 
     

 

  1. Complete the installation by clicking on the "Close" button

In case you have a 32-bit system, please skip steps from 9 to 13 and proceed directly to step 14. ONLY in case you use a 64-bit system, perform all the steps below:

 

  1. Download the .exe file correspondent to "Windows x64" which is the installer for the 64-bit JRE.

 

  1. Choose "Run". The download will start.

 

  1. You may receive a User Account Control warning message. In case your user has the required privileges, just confirm by clicking 'Yes' (11b). If you are logged on Windows with an user which does not have the privileges to install software, you will see in the same window, but as well the field (11a) where you should enter the credentials of another user which has those privileges (usually 'Administrator'). Please enter the required credentials and then confirm with 'Yes' (11b)
     

 

During this phase you might receive as well additional warning message/s from your Antivirus or Internet Security System asking you to confirm your intention to open/execute the file or to confirm that it is safe to open the file. After having checked that the file which is supposed to be executed is indeed the one you downloaded from the Oracle Web Site. Confirm by clicking on Yes.

 

  1. Proceed with the 64-bit JRE installation, using the default parameters.

 

  1. Complete the installation by clicking on the button "Close".

 

  1. Restart your computer. This Step MUST be performed in order to properly set up all the new Java components.

 

 

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