It might not need re-installing, try removing
C:\Documents and Settings\YOURNAMEHERE\Application Data\The Creative Assembly\Empire
but copy out any savegames you want to uhm, save. Also, might have to quit steam when doing it, I can't recall.
launching the game from steam will recreate the folder with hopefully uncorrupted data.
of course, the latest update to steam now gives me an almost unkillable 'memory couldn not be read' box when i quit playing ( from the obnoxious popup for steam online they've inserted into the game ).
but i digress..
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