Dunno if you have an anwser yet
but I use the SetWallpaper command.
And it works great on win9x and win2k
I have no problems with it.
but if I use SetWallpaper + regkey
than it dont work..
So try to use Setwallpaper only

Example
Code:

WriteValue("HKEY_CURRENT_USER\Control Panel\Desktop", "TileWallpaper", "2", "REG_SZ") ; Set the wallpaper to "Center" 

 Select
    Case InGroup("groep1")
      Use I: "\\$server\leerling$"
      SetWallpaper ("\\$server\netlogon\bg\groep1.bmp")
 EndSelect
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Greetz, Bertje