Help with Vista Uninstall (Dual Boot)

I have Windows XP running on my C drive and tried to install Vista in a new
Disk which was formated and partitioned (E and G). I ran the Vista instal
, but it installed in a wrong partition (D). I thought maybe I overlooked
something and tried to run the setup again. Well guess what - it reinstalled
a second Vista profile on the same "D" drive. The installation did not offer
the option of directing it to the formatted and empty drive. How can I remove
these two Vista installs and start all over again. How can I force Vista
to install in drive E??
Thanks.