I guess you want to move everything that you have in 40 Gb NTFS related to Window$ to the 120 Gb NTFS partition so that you have the 40 Gb partition with Linux and Linux only and the 120 Gb with Window$, is that it?
I think you'll have to edit your fstab because my guess is that you don't have the permissions to read and write in NTFS.
as root type in console/terminal
sudo gedit /etc/fstab
I'm using Gnome as DE that's why I edit it with gedit- you'll have to use any available editor that you have.
take a look at my fstab file so that you can see what you can do
/dev/hda1 /mnt/hda1 vfat auto,users,rw,umask=000 0 0
/dev/hda3 /mnt/hda3 ntfs noauto,users,ro,umask=000 0 0
/dev/hda5 /mnt/hda5 ntfs noauto,users,ro,umask=000 0 0
then change that ro to rw. I believe that will do the trick. If you find problems try to use captive ntfs (I've heard is more secure, can't tell you why!)
this works for me because I don't want to write to ntfs but I've already had NTFS with the option of writing to it :-)
see these threads, they might help you
get captive NTFS if you wish
Hope this helps, somehow