When I first tried to run it manually I received the following error message: "Cannot import c:\..... The specified file is not a registry script. You can only import binary registry files from within the registry editor." And inside the registry when choosing import I received. "Cannot import c:\..... The specified file is not a registry file. You can import only registry files." Then I added the top line "Windows Registry Editor Version 5.00" that you suggested and it made a huge difference, because the wallpaper had changed when I restarted the system. I then burnt a new cd with the top line added in the reg tweak... worked again. In other words, my problem seems to be solved thanks to you. Thanks a lot for your help. Now I will try make a few more changes to the cd. I am not so used to reg tweaking (and would like as little code as possible) so if you are not feeling bored by my questions maybe you have some quick answers to three more questions: 1. Under [HKEY_CURRENT_USER\Control Panel\Desktop]. Wouldn't it be enough just to add the "Wallpaper"="C:\\WINDOWS\\Web\\Wallpaper\\MyWallPaper.bmp" (change default wallpaper) and leave out the two other lines ("TileWallpaper"="0" and "WallpaperStyle"="2"). The reason I am asking is that the two lines are present in the registry with values "0" and "2" by default. 2. What does this reg entry [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Desktop\General] with "BackupWallpaper" and "Wallpaper" do for the system? The reason I am asking is that the line is not present (not needed?) on my non tweaked computer and I can't see the connection between Internet Explorer and the choice of wallpaper. 3. Why is double back-slash used in the reg tweaks, for example windows\\web\\wallpaper. Wouldn't it be enough with only a single back-slash for the system to be able to navigate to the correct folder and find the files?