go to bios, set the first boot device to cd-rom
then when you exit and save your comp will restart. watch for it to say "boot from cd..." or something, then press enter.
it will go to a blue screen and start loading windows.
after a while it will say something... press enter, then when it says a whole page of something else... press f8.
on the next screen press the escape key.
from there you can follow the directions in deleting and creating the partitions.
(WARNING!!! you will loose everything on the hard drive WARNING!!!)