Um... I don't HAVE a My Places bar in Word 2007 in Vista. Instead, I have
(depending on settings) Favorite Links and Folders in the Navigation Pane
(left part of the Open, Save, etc. dialog). To add a link to a folder to the
Favorite Links area, just drag the folder into the Favorite Links area.
If you don't see the Navigation pane, click Organize - Layout - Navigation
Pane. If you don't see Favorite Links, then double-click where it says
Folders (left part of window), or hover the mouse over the top edge of the
Folders band until you see a two-headed mouse pointer, and drag downward.