Hi there! The first thing you should do is learn how to mount drives using the command line.
Let's make a mount point for the filesystem:
mkdir /mnt/hda3
and then we mount the drive:
mount -t ntfs /dev/hda3 /mnt/hda3
I have the feeling that your NTFS partition is not the #5 partition, because you have said there are only 3 partitions in total. Try hda3 and see if it works.