This is a good program for changing the logo (boot picture) from windows.
BootSkin (Desktop - Other)


Note*********************
There are actually 2 different places that contain the boot logo. It is totally dependent upon your computer manufacturer as to how to achieve this tweak to your system. Some are done solely through the BIOS and can actually be easily switched through a BIOS function and flashing the BIOS icon.

The other is done through a registry hack. The program I support doesn't hack the system just simply replaces the Icon Picture from within windows.

There are some programs out there that will also change the system properties logo and text for that properties box as well!