This update helps improve installation reliability when you install Windows Vista update 937287. It contains an update to the Windows Vista installation software. The installation software is the component that handles the installation and removal of software updates, language packages, optional Windows features, and service packs.

If your computer is already running Windows Vista SP1 or if you have already installed update 937287, you do not have to install this update. Also, you do not have to install this update if you are using the Windows Vista SP1 stand-alone package to install update 937287.