ntfs is supported, poorly, but supported.
Nevertheless, you will have to mount your ntfs partition(s) properly. e.g.:
a) open a terminal window as root
b) run 'fdisk /dev/hda' to find out the name of your partition
c) press 'p' to list your partitions and to determine which ntfs partition you want to mount
d) press 'q' to quit
e) create a mount point for your windows partition such as 'mkdir /mnt/winhog'
f) mount the ntfs partition 'mount -t ntfs /dev/hda1 /mnt/winhog' assuming '/dev/hda1' is your ntfs partition.
and that's it
You can also add your ntfs partition in your fstab so that it loads automatically at boot:
a) as root, open up '/etc/fstab' for editing
b) add your ntfs mount point on the last line like '/dev/hda1 /mnt/winhog ntfs ro 0 0' assuming '/dev/hda1' is your ntfs partition.
It will be ReadOnly, but you do not want to risk writing to your ntfs partition from linux - funny things may happen if you do.