pop up "loading"

[Raanan]

I have a dashboard that updates information form a raw file that opens and hides alongside it.

Is there a way I can have a pop up (message box type thing) that is a sort of "loading" screen so that users dont try do anything whilst calculations are being performed.

(excel 2007 the calculation thing at the bottom isn't enough )

what i mean is i have a progress bar that just looks good! I need one that updates WITH calculation bar if possible. Or loads in the front whilst calculating.