How to delete root certifcate from Win CE device.

Question

  I want to delete all certificates from the Root folder of certificates ( Start->Setting->System->Certificates->Root).
  I need to delete the certificates using programming. Any body has idea to delete from root folder.
  I have tried to delete certificate manually. But it prompt me error message "You don't have sufficient persmission and device manufacturer certificate can't be delete"...

   Thanks in advance......