do i understand it right, you want to format the NTFS partition and use it as /home?
I'm not an expert but this should work:
(I assume your NTFS partition is /dev/sda1 - if not replace it with the actual one)
1)Format the NTFS partition in ext3 - (sudo mkfs.ext3 /dev/sda3)
2)mount the partition (sudo mount /dev/sda3 /mnt)
4)go into single user mode to make sure all files in home are closed (sudo init 1)
4)copy the current data from your /home folder to the fresh partition (sudo cp -ax /home/* /mnt)
5)unmount the partition (sudo umount /mnt)
6)edit /etc/fstab (sudo pico /etc/fstab) and add a linke like this:
/dev/sda1 /home ext3 defaults 1 2
save and close (ctrl+x)
7) reboot (sudo reboot)
after rebooting you can check that the partition is mounted under /home by entering sudo mount - there should be an entry like /dev/sda1 on /home type ext3....
You probably also want to remove Windows from the Grub menu.
sudo pico /boot/grub/menu.lst
then comment out or delete everything that comes after ### END DEBIAN AUTOMAGIC KERNELS LIST
press ctrl+x to save and exit.
You might want to consider to split the partition and instead of mounting the whole 110G as home and use 1 partition for /usr and one for /home.
Hope it helps