How can I reformat my Dell Inspiron using DataSafe BackUp CD?

My Inspiron Dell Inspiron Laptop has a built-in Windows Home Basic 7 OS. It was infected by a virus so I want to reformat it. I do not know how to reformat this laptop without an original Window 7 OS CD. All I have is my Dell DataSafe Local BackUp CD. How can I use my Dell DataSafe Local BackUp CD to reformat my laptop?

