programme named magic partiton can do that!!
dos either!! or you can make it when you format your comp using the version of window xp!!
you must format your comp if you want to make a partition!sp back up your files first!
Yeah I don't use any 3rd-party software for re-partitioning, I would do as sam said earlier in formatting with an OS boot disk. With the disc unpartitioned its a bit of a catch-22 as in you have no extra partition to backup important things