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Look in the HOI2 support forum, you will find a sticky thread on how to manually uninstall, just substitute Crusader Kings or CK for HOI2.

Not sure if the Download version has the exact same syntax but it should be simmilar.

The thing with the ondemand version is that you should never be installing from CD. You should just log back on and DLed it from the net.
 
Well you bought the Ondemand version right?

And you downloaded it from Paradox's vendor.

You should be able to log back into that site and reinstall from there.
 
Most welcome.