Here is a simple script that will allow you to have a background when someone is logged out, say company logo or something. It will also set a special screen saver when no one is logged.
Because you are working in the .Default regfile I recommend running this adv when no one is logged on. Changes will not be see until you do a reboot.
Reg file
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Windows Registry Editor Version 5.00
[HKEY_USERS\.DEFAULT\Control Panel\Desktop]
"ScreenSaverIsSecure"="1"
"ScreenSaveTimeOut"="60"
"ScreenSaveActive"="1"
"SCRNSAVE.EXE"="Custom.scr"
"Wallpaper"="CompanyLogo.bmp"
[HKEY_USERS\.DEFAULT\Control Panel\Screen Saver.Slideshow]
"PaintInterval"=dword:00000000
"ChangeInterval"=dword:00001770
"DisplayFilename"=dword:00000000
"MaxScreenPercent"=dword:0000005a
"DisableTransitions"=dword:00000000
"AllowStretching"=dword:00000000
"AllowKeyboardControl"=dword:00000000
"MaxFailedFiles"=dword:000003e8
"MaxSuccessfulFiles"=dword:00010000
"MaxDirectories"=dword:000000c8
"ImageDirectory"="c:\\windows\\screensaver\\"
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User.reg
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Control Panel\Desktop]
"SCRNSAVE.EXE"="Custom.scr"
"Tilewallpaper"=0"
"ScreenSaveTimeOut"="600"
"ScreenSaverIsSecure"="1"
"ScreenSaveActive"="1"
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user screensaver.reg
[HKEY_CURRENT_USER\Control Panel\Screen Saver.Slideshow]
"PaintInterval"=dword:00000000
"ChangeInterval"=dword:00001770
"DisplayFilename"=dword:00000000
"MaxScreenPercent"=dword:0000005a
"DisableTransitions"=dword:00000000
"AllowStretching"=dword:00000000
"AllowKeyboardControl"=dword:00000000
"MaxFailedFiles"=dword:000003e8
"MaxSuccessfulFiles"=dword:00010000
"MaxDirectories"=dword:000000c8
Install.bat
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rem This file must be run as admin since it sets the main default setting for the computer
rem Use company logo for screen saver.
regedit.exe /s no-one.reg
md "%windir%\screensaver\"
copy /y CompanyLogo.jpg"%windir%\screensaver\"
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