Watch your fstab in /etc/fstab(in root mode, and have a backup)
Should appear something like that. (I copy and paste the line of the mounted ntfs partition, all in one line)
/dev/hdaX /mnt/windows_D ntfs-3g defaults,auto,nonempty,force,locale=es_ES.utf8,users 0 0
In the X put the number of your D windows partition.
Then restart.