Multiple Versions of Windows XP

[DRTP]

Hi,

During re-installation of Windows XP Prof I have ended up with multiple
versions in the computer from which which I have to select one on re-booting.


Can you please let me how to clean up the system or format it so that I can
re-install and end up with just one version of the operating system.
Currently I am getting an error message when I try to format the disk.

Thanks in advance.

Regards,

DRTP