When you start a dialogue box to open or save a document, Office initially displays your working directory. To change this directory:
Choose Tools - Options - Office - Paths.
Click My Documents and click the Edit button, or double-click on My Documents.
In the Select Path dialogue box, choose the working directory you want and click Select.
You also use this procedure to change the directory displayed by Office when you want to insert a graphic. Choose Tools - Options - Office - Paths - Images, then follow step 3.