I tried to replicate your problem with my own ntfs partition, in fact i too didnt had the write permissions on the ntfs partition,
The answer to why you are not able to mount the ntfs parition with write permissions lies in the FUSE library.
In the screenshot which you have pasted, it says you are trying to mount a ntfs block device using FUSE library.
First check if you have fuse-utils package installed on your system, if not install the fuse-utils package using apt-get
Then, remove the following lines from your /etc/fstab
/dev/sda2 /media/myMountPoint ntfs-3g quiet,defaults,rw 0 0
Now, we need to mount the ntfs block partition using fusermount command
Now, open the /etc/mtab with root priviliges, and add the following line
/dev/sda3 /media/D fuseblk rw,nosuid,nodev,allow_other,blksize=4096,default_permissions 0 0
replace with your partition and mount point and reboot the system.
Sorry for putting this in separate answer, i could not write all this as a comment. After the reboot, when i mounted my mountpoint, i was having write permissions, tell me if it works for you too.