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What publisher is your version and where did you download your 1.05c from? If you downloaded an installer from the publisher you might want to just get the zip file from Paradox instead. Just unzip into your HoI folder (overwrite files and use directories).
 
Things come in pairs today. :)

The problem Could also be with the path, Did you install to C drive and the default path? If not edit the registry entry to reflect the correct path to the game.
 
Persistance ... and all that, glad you got it to work. :)