Changing the boot up screen.

The image that is displayed during the boot is hidden away in a sytem file called ntoskrnl.exe. This system file is loaded during startup and the image and animation in that is displayed. Users have to use hacking tools to hack the file and replace the image.
Majority of users does not do it their own . instead they download it from some sites.. This method works for some people but for somebody it may cause serious errors.