Outlook 2003 Security

I need to be able to disable security settings in Outlook 2003. What is happening is that the President is using an HTML page created in Front Page as his signiture. When he goes to write an e-mail, as soon as he clicks "New" it is giving him a warning message about Active X and it is annoying him. He clicks OK or Yes - and it is fine. It did not do this prior to the upgrade from Outlook 2000. Is there a way to just specifically shut that off?