Default Background

I've run into issues with this in the past: a user thinks they're cute and sets up a background but for some reason it always shows up as the default. Here's the reg entries to remove it:

Here's how to change which bitmap displays on the desktop before Windows NT log in: "With a simple registry change, you can change the default bitmap that displays behind the logon prompt in Windows NT 4.0. You will need to have the bitmap you want to use in the Winnt directory, with an 8.3 naming convention name.
Hive: HKEY_USERS
Key: Default\Control Panel\Desktop
Name: Wallpaper
Data Type: REG_SZ
Value: Full path to the bitmap
There are also other Values that apply:
Name: TileWallpaper
Data Type: REG_SZ
Value: 0 for tiling, 1 for no tiling
Name: WallpaperStyle
Data Type: REG_SZ
Value: 0 for normal, 2 for full-screen"