Tools > Options > Security > uncheck "Make hidden markup visible when
opening or saving".
Realize, though, that the option is checked by default for your
protection. If you send a marked-up document to someone else, not
realizing that the markup is there because you've hidden it, the
recipient will be able to see it. If it's confidential or possibly
embarrassing, you'll have no one to blame but yourself.
--
Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org