Mounting volume error opening partition device Permission denied

Using ntfsfix with bootmed and getting "Mounting volume... Error opening partition device: Permission denied". I got this when fixing my wife's windows machine. Basically, make sure you are using sudo in front of the commands. These two steps fixed the laptop.

1. Use sudo fdisk -l or Gparted to find the NTFS volume.
2. sudo ntfsfix /dev/{ntfs-volume}