Now i've done something dumb again. please help.

[Castellon]

You could try removing it from the add/remove program screen.

Or do it manually.

Delete the Folders, keep your saves if you like.
Then remove the HOI entries from your registry.

 

[Castellon]

Try this link
http://www.europa-universalis.com/forum/showthread.php?threadid=57457

 

[Castellon]

Great!