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When you reinstalled HOI did you completely remove all trace of the game from your system first? Including delete directories, and fix up the registry. you can find instructions on doing this in the sticky thread at the top of this forum.
 
Go to the self help guide, then notice that #1 which says "Uninstall HOI" is a link. click it and you should have the instructions.

let me know how it goes.
 
Where did you download the patch from?