Unfortunately, while Knoppix can sometimes read partitions even when Windows will not, Windows is also quite capable of destroying it's directory information so much that Knoppix can't read it either. I have 2 hard drive in this state that I can't recover the data from (had 3 but gave up on one). There is still a chance that the partition is fine though, and that what has been mucked up is the partition table that points to the partition. In that case, Knoppix can examine the drive data and try to rebuild the partition table. A good partition table that points to the proper part of the disk for the partition would save your data. This has worked for many users here. read the man page for the command gpart or search the web for more information on gpart for details on this command. Good luck.