It might be that your NTFS partitions are mounted read-only. This sometimes happens if the filesystem was not unmounted cleanly.
To check this, open a terminal and type:
Look for the NTFS partitions and see if they are mounted "ro" or "rw". "ro" indicates that they are read-only.
You can try remounting them rw:
sudo mount -o remount,rw [filesystem]
where "[filesystem]" is the NTFS filesystem in question.
It's likely that they will still not remount as read/write if they were improperly unmounted and are unchecked. In that case, you should reboot your system into Windows and run the disk checker from there. After that your partitions will be marked as clean and able to be mounted read/write again.