Unless you really need to boot from a floppy, you should get the CD version of Knoppix. I have used it a bunch before. There is no partioning of hardrive space and the CD version has a lot more content as well.
If your comp wont boot from a CD then try to tweak your boot order in your BIOS.
I'm pretty sure 3.5 is the latest version. Also try looking at P.H.L.A.K, its another LINUX boot cd that has a lot of cool utilities as well, and its uber fast.
Hope I helped.
"Mr. Potato Head, MR. POTATO HEAD! Back doors are not secrets!"