Can you change those options?
If it doesn't than you have to get a bootable floppy, and type in "d:/" press enter, than "setup" for older os's.
Xp has another way of doing it though, boot from a bootable disk, type in "smartdrv" press enter. than type in your CD drive letter e.g. "D:/" enter again. than type in "cd\i386" than type "winnt"
Than you will go to set up.
If that deosn't work, google