OK, then here's what's going on:
Your hard drive apparently got mounted read-only because of an improper shutdown in Windows last time. The read-write NTFS driver will not go by default if the drive is flagged dirty by Windows, and then the default mounter takes over and mounts it read-only.
Once the scan is done and ONLY once the scan is done, type this in a console box:
"umount * /dev/sda2" (no quotes, * indicates a space)
"ntfs-3g * /dev/sda2 * /mnt/sda2 * -o * force"
This will force it to give us read-write access to the hard drive, which will be essential to fixing this. But if you do that while it's scanning, it flat out won't work, or it'll interrupt the scan.