NTLDR is the NT Loader. So someing in Windows is giving you problems, no shock there. Have you tried booting Knoppix? On most cases Knoppix can see the files on your system just fine, although there are obviously some problems with the file system that can destroy files well enough that they are not really there and Knoppix can't see them either. If you have a FAT partition Knoppix might even be able to let you replace files, but of course it can't include any Microsoft copyrigted files. If you have NTFS partitions then Linux can not sadely write to them, but it can stillbe used to make backups of the files before a complete reinstall. There are many ways to backup the files; across a network to another system is one of the most popular, but depending on what needs saved external USB devices, even flash devices mauy help, burning optical media (some tricks may be needed here if you have only one optical drive), and even adding an addition drive, partitioning it FAT, and copying files there all have been suggested.