The page number formats, including restarts, are determined by the settings in the Page Number Format dialog box. Make your modifications via Insert tab | Page Number | Format Page Numbers. (Note that these settings can be different for different Word sections.) When you are done, don't forget to update the TOC.
If you are trying to set up a front matter, see
http://word.mvps.org/faqs/formatting...atter_2007.htm.