Worst come to worse, I'ld pull out a win98 startup disk, delete all partions, format for Fat32(just for good measure), then use XP to reformat NTFS, that ought to destroy and thing on there, also run fdisk/mbr instead of just fdisk, this will clear your Master boot record. Also if you have it available, PartitionMagic, could destroy everything you need to get rid of.