User is unable to browse for and change desktop wallpaper.
The background options on the Desktop tab in the Display Properties are greyed out due to Windows Group Policy enforcement.
Open regedit and browse to the following key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop Change the value of NoChangingWallpaper from 1 to 0.
Then browse to: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Change the value of NoActiveDesktop from 1 to 0.