what step did you get before this when i instaled ubuntu over my xp profesipmal there was an page before that which said 3 things. with a box next to it for u to click that option.
1. install ubuntu within xp
2.wipe out xp and install ubuntu on whole harddisk
3.manualy assign partitons
i chose option 2,and presed next and it went to that page and showed me all the partions i had and press next to cointonue
tell me if u have,anything similiar