For windows XP, 2000 and Longhorn
There are many different soft wares that can help you to change the windows boot screen. You must be professional to be able to use these types of soft wars.
These soft wares help you to patch the kernel file in your system so you should accept the risk of boot failures but the Boot Skin changes the Boot Screen safely and there is no risk.
Download http://www.download.com/BootSkin/3000-2105_4-10285566.html?tag=lst-0-1 871KB
From www.stardock.com