Because the format would have erased the whole drive, including the existing copy of Windows.
Tell exactly what you did: questions of setup and answers you gave. One of them must have been wrong.
You could use a program called DBAN (free download) to erase everything on the disk, including partition data and start all over as if it was a new disk, but that shouldn't be necessary.
I want to have a fresh system so I decided to format, Now I have two Windows XP installed, I want to get rid of everything and start fresh. I inserted the windows XP CD, selected Fresh copy and went on with the process, I was given the choice to Convert to NTFS but no option to repartition of format drives. is this because I have two operating systems.
I will be grateful if someone could tell me how to remove everything and start from the begning.