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Change desktop background
Windows 7 Starter Edition,

Edit registry HKEY_CURRENT_USER 
select Control Panel. In the Control Panel tree, select Desktop.

Change the wallpaper path
After selecting Desktop, find the entry labeled Wallpaper and double-click it. 
In the field, enter the path for the new wallpaper image. 
Example: “C:\Users\John\Pictures\new_wallpaper.jpg”

Change the permissions. 
Right-click on the Dektop folder. 
Click the Permissions option. Select Advanced and then the Owner tab. 
In the “Change owner to” box, 
highlight your name (there should only be your name and the administrator) 
and press OK. 
Click on Advanced again. 
Uncheck the box labeled “Include inheritable permissions from the object’s parent…” 
When you are prompted, click Remove. 
Click Add. Type “Everyone” into the field and press OK. 
Allow Read Control, and then click OK. 
Click OK in the next window. 
Highlight the new Everyone entry and check Allow for Read. 
Click OK.x. 
Restart your computer. 
Once your computer has restarted, you should see your new desktop wallpaper.