Windows Vista vastly improves overall quality, security, and reliability as compared to previous versions of Windows. Though there are tremendous investments in Windows Vista to ensure backward compatibility, some system enhancements, such as User Account Control, make Windows Vista behave differently from previous versions of Windows. These enhancements affect development of Microsoft Office 2003 add-ins with Visual Studio 2005 Tools for Office Second Edition. This update fixes those issues.
Please note that this update does not install a full version of Visual Studio 2005 Tools for Office Second Edition.
You can download the update from here.