Due to the increased security features in Windows XP Service Pack 2, Microsoft disables all ActiveX components by default. Even if the user’s security setting is set to Medium, Internet Explorer will not let the user download the ActiveX component that is required for
the A.I.D.A. Desktop installation. If the user gets the error message, they will need to enable the "Automatic prompting for ActiveX controls" option in the Internet Explorer Security Settings. This can be achieved by following the steps below: Step 1: Open Internet Explorer, select Tools and then Internet Options, this will open a window. Select the Security tab (as per the screenshot below)
Step 2 – Click on the Custom Level button. This will bring up the following screen
Step 3 - Click the Enable button under Automatic prompting for ActiveX controls whereby a warning message will be displayed saying “Are you sure you want to change the security settings for this zone” Click Yes. You should now be able to download the A.I.D.A. Client without any problems.