Error2: Error mounting: Mount is exited with exit code 14. ntfs_attr_pread_i: ntfs_pread failed: Input/Output error. Failed to read $AttrDef, unexpected length (-1 !=2560). Failed to mount /dev/sdc1': Input/output error.
Looks like your file system has gone for a toss. try running fsck on it to see if that does any good. [fsck -t ntfs /dev/<dev>]