1Open your registery
2Goto HKEY_LOCAL_MACHINE/SYSTEM
3Edit Shutdown/1 =>Values/Splash with your new /Windows/xxx.bmp
4Edit Startup/1 =>Values/Splash with your new /Windows/xxx.png (this is 1st splash)
5Edit Startup/2 =>Values/Splash with your new /Windows/xxx.png (this is 1st splash)
Use the originals as templates