You can set desired screensaver and wallpaper in unattended installation.
for that simply go to desktop display properties.
-go to desktop tab
-browse and select your desire wallpaper (same in screen saver)
-Now go to theme tab
-click on save as.. and save your edited theme in windows\resources\theme
-now copy that theme and all supported file to $oem$\$$\resources\theme
-And now open your winnt.sif file and set the new saved theme as default.
Note:- Your desire wallpaper should be in same path when it was during you save the theme
for example:
In display properties, in desktop tab
i browse wallpaper from \windows\web\wallpaper\NAME.jpg
and i copied that wallpaper to \$OEM$\$$\web\wallpaper.
i hope you can do that, i did this.
if u r not satisfied. convay me i will give u a registery tweak, it will definately work but after doing
from registry you will not been able to change your desktop wallpaper later until you delete that registry.