First of all, I don't want to get your hopes up. I've had several NTFS partitioned hard drives crash under Windows and Knoppix has been unable to recover files from any of them. But there are many people who have had some luck recovering fiels from crashed windows systems. Unfortunately, this is usually when there are problems with the Windows OS files on the disk that are keeping the disk from booting, not when windows has scrambled the system so bad that even other recovery tools can't get to it.

Before giving up, I would suggest that you read up on two Linux tools that might help you. One is gpart and the other in testdisk. gpart is a utility that can help recover data if the problem isn't that the data is corrupted, but rather that the partition table has been mucked up and so the pointers to the partitions (or other information like the partition type) are corrupt or just missing. It will examine the whole disk and suggest what the partitions should look like (if it can make a determination). testdisk does a number of test but among them is also partition recovery. I generally prefer gpart and find testdisk to be a dumbed down "for dummies" version of the tool, but in this case I might try testdisk. But my actual advice is not not rush to do either, read up on each on the Internet and decide which if either you want to try.

Also I should mention that in some versions of Knoppix, testdisk is bad and will give an error. I don't believe this is the case with the 5.3.1 DVD version, but it was in some of the earlier 5.x CD versions.

If you do manage to see any files my advice is to not write them to another NTFS disk partition with Knoppix. Either save them to a FAT partition or drive, or transfer them across a network to another computer.

Good luck.