Installing and removing Windows components
When installed Windows 7 already has a standard set of components that is suitable for most users. Not enabled by default, as a rule, are various tools and utilities that may be required only by technical experts.
To install additional built-in applications, open the "Programs and Features", click on the link "Turn Windows features on or off" and confirm your actions if necessary in the UAC window. The window that appears will contain a list of all available components. If the check box next to the name of the component is checked, then the application is present in the system.
To install a new component, click on it's check box, and to delete the existing one - uncheck. After performing desired actions, click "OK", and the system will perform necessary steps to enable or disable components. When disabled, the programs are not removed from the hard drive, to reactivate these components you need to re-check the box.