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#11
I believe I would mark the Win8 partition Active and run Win8 Startup Repair from it's DVD or Repair CD. It should reestablish the metro-style Multi Boot screen.
http://www.eightforums.com/tutorials...ndows-8-a.html
If it fails to create the Multi Boot Menu then install EasyBCD to Win8 to add the other two OS's on the Add OS Entry tab. Save each separately.