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I take it we are talking about HOI2 and NOT Doomsday.
Did the patch appear to install correctly?
Do you have both games installed?
do you have more than one copy of either installed?
 
delete your internet cache, and the patch, then download a new copy of the patch, and try it on a fresh install.
Are you installing to C: drive and using the default path?
 
From Your browser
Tools- Internet Options - under "Temporary Internet files" there is a button to delete the files. Do that.