I've windows XP on my hd with 2 partitions, freed 8GB of unallocated space intended to install knoppix.

ran knoppix-installer, try to install, get "formatting of failed" error. Then I proceed to make partition, chose my HD (only 1 choice as I only have 1 physical HD), then I get the "Opened disk read only - You do not have permission to write) error.

Tried sudo cfdisk, created a ext-3 partition using all 8GB, went back to knoppix-installer and still got the same 2 errors

Please help