Run as root to access your locked files. To run konqueror as root type"kdesu konqueror". You will need to set a root password first.
AFAIK there is no hda0; there is just hda (meaning the whole HD) which is divided into hda1, hda2, etc.
If the HD is now functional (ie you have repaired the MBR), you should be able to get into your knoppix HDinstall and reinstall lilo. See this: http://www.knoppix.net/forum/viewtopic.php?t=16915