ExtremeTech has a chapter of Hacking Knoppix on their site about using Knoppix to fix Windows. Included is useful information on partitioning, making changes to Windows, and Backing up data.
You or someone you know will encounter a seemingly unfixable problem with a Microsoft Windows operating system environment at one time or another. When this occurred in the past, most users would reinstall their operating systems, sometimes wiping out significant amounts of data that was needed on the system. Now you can use Knoppix to (often) correct your Windows system problems without losing any data and save the time associated with reinstalling all of the operating system files and applications.