Using GParted in Knoppix 6.2 to resize my NTFS partition caused Windows to stop working. GParted gave a message to the effect that the volume is smaller than the partition. Anyway, I am not blaming Knoppix at all.

The sad thing is that I couldn't mount the drive in Knoppix as well, even manually from the terminal. I had been playing with DSL-N before trying out Knoppix, and I was able to mount the drive and back up my user files, then re-installed Windows. ( By the way, this is my work laptop, otherwise I would just have foregone Windows completely )

I am happy with Knoppix/Linux. As for NTFS, better have a backup elsewhere before writing to it from Linux.