It sounds like you are trying to use SaveAs to save over the top of your
existing normal.dot. You'll run into big problems if you ever do this.

See http://word.mvps.org/faqs/customization/CustomizeNormalTemplate.htm and
http://addbalance.com/word/defaultfont.htm

You may or may not be able to get to the user templates folder directly.
That will depend on your file permissions and whether, if you have
permissions, you have set your views to let you see system and hidden
folders and files. As you'll see from the first article above, though, you
do not need to open normal.dot to change your font or margins. If you open
the template, you will see the name of the template in the title bar, rather
than Document 4.