Microsoft Knowledge Base Article 301180 contains the following summary:
This article describes how to add programs and Windows components to your Windows 2000-based computer.
The Add/Remove Programs tool helps you to manage programs on your computer. This tool enables you to add a new program, or to change or remove an existing program.
Also, you can use the Add/Remove Programs tool to add the Windows 2000 components that you did not select when you performed the original installation of Windows 2000, for example, networking options or Indexing Service files.