

The Installation options tree displays a white box if all features are installed and gray if some features are either "not available" or are installed on first use. You'll want to choose Add or Remove Features.

Tip: type Add Remove Programs in the search field in the Control Panel to find it (works in all versions of Windows). Go to Control Panel, Programs and Features (Vista and Windows 7/8/10) or Add/Remove Programs in using Windows XP.
