reicherb, i don't know i would just disable delete norton, i know that you cant boot into windows but if evrything else fails (as a last resort), then from a boot disk delete norton! its a long shot but i know from pasttime that antivirus software and sytstem file protection could mess up things regardless of antivirus brand. I always disable system file protection (the first thing i do).
if you are gonna trie the delete norton-option then please let us know if it works (before you do that hang on for a while and see if you get any other help here).
note: Also you could do a reinstall winme in winme (dunno if your files programs would be intact though).
edit: note