can't change first half of the setup screen in Vista?

[Pistachio]

i have changed all the images in my DVD sources files, install.wim files and boot.wim files. I could manage to change the setup screen after the setup restarts after expanding the files , but before that, i have the same default screen. I changed the following files:

spwizimg.dll in DVD sources folder

spwizimg.dll in mounted Install.wim

ooberesource.dll in mounted install.wim

WINPE.bmp in mounted Boot.wim

spwizimg.dll in mounted Boot.wim

so is there any other file which needs to be changed to get my own setup background ???