You'll probably want to map what image editing program you'd like to use. I personally am using Image Ready here. This makes it so that when you double click on the image it'll open right up in your editing program for easy editing.

If you already have your .bmp ready you can just right click somewhere around the windows logo and select delete this temp bitmap. You'll be prompted to hit OK. After that right click again and select load a new image. Browse to where it's at. You will most likely be prompted that it is not in a 16 color format. Hit yes to convert it. If you get some kind of RGB scale warning just ignore it and hit OK. I've found that this doesn't actually cause any problems in MY CASE.

After this you'll see there's still a couple more items to change. The word Professional (Says Home on Home editition) is in the way and the loading bar is too. Make sure that you keep the loading bar in mind when you're creating this. You will only be able to drag it around Vertically and not horizontally with this program. Yes it is possible to move it horizontally, but it involves hex editing.

First lets move that loading bar down to where I want it.

Now that it's where I want it we can move on to getting rid of the overlay that contains the word Professional in it. (If you're using the home edition it will say home) Towards the upper left you will see where you select which bitmap. In my case I am choosing Overlay (Pro) The home edition people need to use Overlay (Home).