I have applied the reg key as per Windows 7 Gotchas which works really well. I have a background folder located in the Netlogon share and just update the file within here to change all workstations. My issue is that it seems quite random to each user/machine on how to display the wallpaper. I have some users that will have the wallpaper centred, some tiled, some stretched etc. Can i force a centre wallpaper for all users through a reg key?