Im not sure if you can mine CPU and GPU at the same time.  Im su9re its possible but I dunno what problems it might cause.

With Windows you are probably gonna have to do some tweaking to get all your GPUs to work.  Like make up some dummy plugs, and make sure you run the two MAX_ALLOC... commands.  Forget exactly but youll find them if you search.

If this will be a dedicated mining rig I suggest using Litecoin BAMT.  It seems complicated but its really alot easier and my BAMT rigs run 24/7 for months.