linderman

ahhhh now i see ....... I think your problem is win xp cant see or use partitions that were made with vista ......... but Vista CAN use partitions made with XP ...... this is just a hunch so pleaseeeee....... folks ....... if I am wrong just correct me without the flames LOL

what I would do in your situtation is wipe the drive with the free downlaod killdisk ....... this will wipe the drive so its just like new

then use the drive manfacturers tools (WD= data life guard Seagate = seatools etc etc) to partition and format the drive with NTFS

then install XP on one of the partitions and vista on the other if this is your goal?