your not being clear, we need more info about what you did,

it sounds like you tried to install knoppix to your harddrive?
eitherway, read this about fixing the mbr to reboot windows.

knoppix would not have done this without your intervention, it doesnt even mount the drives without your say so.

lastly, knoppix installs lilo and not grub, if you have grub in your mbr, it came from elsewhere, either fedora or suse possibly.