Set your folder rights..
HTML Code:
rw levels/*
rw levels/*/*
rw npcs/*
rw scripts/*
rw weapons/*
To completely wipe your NC (or how I've done it anyway):
Use the command: /npcshutdown
Delete all the files in weapons, and scripts, and delete everything except Control-NPC in npcs.
Then start the npcserver back up with: /npcstart
Everything else is just deleting levels, and so on.