In general, Knoppix itself touts the toolkit-for-rescuing-Windows-installations image: "Knoppix Hacks" has a whole slew of these types of hacks.

Personally, more than half the time I'm on a computer, any computer, I use Knoppix as my desktop. Most of the computers I have access to (clients, friends, family, etc) have the 381 iso on their hard drive so I can bootfrom it and free up the (possibly only) CDROM drive. Coupled with my USB drive, I have a reliable, consistent platform to answer my computer needs where ever I happen to have computer needs.

One of the only pet peeves I have with Knoppix is that Ubuntu handles installations better in-so-far-as automating security patches, etc. Ignorant/lazy users needn't do anything other than click on the big warning button that appears automatically whenever patches become available.

I view Knoppix's toolkit-for-Windows abilities not as a limit to how Knoppix should be used but as yet another reason Knoppix is such a useful IT resource.