Try Method 2 in
http://word.mvps.org/FAQs/Customization/RestoreMenuCmd.htm first.
If that doesn't help, then see
http://word.mvps.org/FAQs/AppErrors/MissingMenusEtc.htm , except
that your Word 2003 data key will be in
\HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Word\Data .
> Where to find these absent functions and how to replace them on the Word menu
> bar. Only Word affected. (Other programmes e.g. Excel OK.) Want to use
> Mail merge in particular. Only know how to get it from Tools.
> Office 2003. Windows XP.
> Have already tried re-installing OFFICE.
> Any advice much appreciated.