I believe that what you need to do, is not simply change the optins in your document, but in the template on which it is base.d This is probably Normal.dotm. Go to the Office button adn select New/Installed templates. Normal.dotm should be listed. Be sure to Open it, so that you see Normal.dotm in the title bar, not Document 1. Make the changes you want (no auto corrects, formatting, etc.) and save the template.

Does that do the trick?