Are you saying it opens with the Markups toolbar visible? If so, you could start a startup check, and if it is visible, turn it off.
If Application.CommandBars.Item("Reviewing").Visible = False Then
Application.CommandBars.Item("Reviewing").Visible = True
End If
Or do you want to turn the display of revisions off?
ActiveDocument.ActiveWindow.View _
.ShowRevisionsAndComments =False
Gerry