How many polygons did the scene have? I run into this problem all the time because IC becomes unstable after 200-300k polygons. It's a real shame - I had big plans with this software but the software limitations prevents me from doing anything epic with it.
Go to %temp%, and delete everything in there.
Then launch IC (select not to load the scene), and go into the settings/preferences and turn off all of the graphic features IE: shadows, etc.
Try launching the scene and see if it lets you load it.
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