i suppose u want to mount C:\ in /mnt/win_c/ then the entry in ftab file will look like (as is mine)
/dev/hda1 /mnt/win_c/ ntfs iocharset=iso8859-1,ro,umask 0 0 0

well your other prblem is not very clear try to explain it in more detail along with the error messages(if any) you are getting