how to enable / disable macros in word 2003 or word 2002

To work around this behavior, close the document and change the macro security level to Medium. To do this, follow these steps:

1. On the Tools menu, click Options and then Security then click Macro Security.
2. On the Security Level tab, click to select Medium, and then click OK.
3. On the File menu, click Exit to quit Microsoft Word.
   
   NOTE: Though there is no warning message telling you to restart. You must quit and restart Microsoft Word for the security level change to take effect.

This sets the security level to Medium. You will see a prompt to enable or disable macros when you reopen the document.

- Mihir Patel

Ref : http://support.microsoft.com/kb/290949