As far as I know, you can't change the settings for the Common Dialog Boxes. You'll have to create your own popup form.
You could create a form with a two labels on it and a command button(ok). When you need the box, open up the form, set the first label to bold and put your first sentence. Set the second label to the rest of your info. You can then process items after the OK button is pressed. Hope this helps.
Doug