yeah i couldnt get the facking to unistall either.
just do this.... save ya maps/mods/config files and delete the whole EA\MOHAA directoty structure.
now go here
http://www.jv16.org/ and get regcleaner. open it up and you are wanting to delete the registry keys for 'EA' and 'mohaa'. after thats done you should be able to reinstall as though you never have before.