File associations keep changing

I have a user that uses ClarisWorks and Office2K on NT4 sp6. Everytime she uses cwks, all her file associations change so that a .doc is now associated with Claris instead of word. Reinstalling office fixes it untill she uses claris again, then theyall change back. How can I stop Claris from taking over the machine everytime she uses it! Changing the association in explorer doesn’t do the trick either…
Ideas?