OEM toshiba installation disk

I am in need to install a seconde WIN XP PRo in the E: partition of the HDD that already has one of it installed in the partition C: but the OEM toshiba installation disk from a WIN XP PRo get me only the option to Restore the original default system installed in all default settings ( the default partition is the C:). Please, help me. What to do to install more one OS in patition E: with THIS SAME INSTALLATION DISK disk whithout overwrite the OS that is already installed in the C: partition?