I have seen this dialog before. Generally it seems to be associated with a setting in the Graphics Control Software (nView or Catalyst) which forces off-screen dialogs onscreen (i.e. normally this dialog would be off-screen, but it is being forced on-screen by this setting).
Check the "Prevent Windows from Opening Off-Screen", and "Reposition dialog boxes on" settings within nView. I found the following webpage with information on these options: http://www.tweakguides.com/NVFORCE_8.html