A software tool and method are provided for selectively installing service packs in a computer system according to dependency information and whether or not an upgrade to an application is scheduled. The method comprises prompting a user for desired setup information and installing the service pack associated with an existing application if the application requires the service pack and if the desired setup information indicates that an upgrade component corresponding to the application is not to be installed. In addition, the service pack is installed if the upgrade component is to be installed and if the service pack is required for upgrading the application.