Microsoft has used a new Betta Fish Boot screen in Windows 8 Consumer Preview, in this boot screen a Betta fish is shown with some circles and a cool animation at the bottom of it.
If you are still using Windows XP then you can get same boot screen on your machine, PeterRollar at DA has made a boot screen which is very similar to Windows 8 one.
As you can see there are 2 images above, You will get boot screen as in upper image and bottom image is shown between bootscreen and login screen.
You need to have TuneUp Utilities installed on your computer to use it, just open boot screen in it and it will apply your new bootscreen.
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