Hi
I don't think you can, but why would you want to?
At least you know what it's doing, otherwise you would just have a black screen while Windows is loading and wonder if it's working or not.
If you mean can you skip the loading process, you can't it just has to do it's thing.
Unlike the Windows that you can change, this kind of thing is coded in and doesn't have an option to modify it or substitute something in it's place, especially since it's animated and not just a .jpg image.
Mike