Отиваш на References ->add reference -> COM добавяш
Microsoft.Ofiice.kakwoto ti trqbwa
-> using Microsoft.Office.Interop.Excel/Word
и всичките класове и прочие трябва да ти се появят.

M/у другото
If you have Microsoft Office FrontPage 2003, Microsoft Office Access 2003, and Microsoft Office Excel 2003 installed, Office Web Components allow you to publish interactive data as part of a Web page. Used with Microsoft Internet Explorer version 5.01 or later, Office Web Components allow you to view a published control (spreadsheet, chart, or database) on a Web page and to view data access pages.

Не насилвайте нещата - вземете по-голям чук.