You clearly have a failed ntfs file system if not a failing hard drive. There are methods to repair an ntfs filesystem. The command: apropos ntfs ; will give you a list of usefull ntfs filesystem utilities. There is also information on the web regarding replacing boot sectors with copies that are placed on the disk at filesystem creation time. As these use direct disk writes, they are dangerous. Always make copies of any sectors you intend to replace. I would try the ntfs tools on the knoppix disk for starters. Also, if your data is important, you may wish to make an image to a second disk before trying any repair. The command: dd if=/dev/hde of=/dev/hdf bs=32768 ; will create an image of the input file (if) to the output file (of). Copying your drive to another this way will retain an exact copy although put some serious stress on it. The drive used for the copy must be at least as large as the drive being copied and will have any data on it overwritten. Depending on the disk size, this could take some time (several hours). Start reading.