Windows 7 - Block Wallpaper Change BUT allow Selected Slideshow Wallpapers

System: Windows 7 Pro with SP2

Please can you help me find a solution to Allow Wallpaper Slideshow using a preselected folder BUT block anyone from changing the wallpaper.

The issue I am coming up with is the due to the slideshow option as most of the solutions allow for this but crucially only one wallpaper is ever displayed.

I appreciate anyone's thoughts or opinions and below is the list of attempted solutions that have not worked for what I am looking for:

Attempt 1: Group Policy Editor

Type gpedit.msc and press OK to open the Local Group Policy Editor.Navigate to User Configuration > Administrative Templates > Control Panel > Personalization.Double-click the Prevent changing desktop background option.Selected Enabled option

RESULT: Removes access to change wallpaper BUT ALSO blocks the wallpaper slideshow - the wallpaper just remains on the wallpaper it was on right before this solution was enabled.

Attempt 2: Registry Editor

Open the Registry Editor.Navigate to HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Policies.Right-click on the Policies key (folder) and select New > Key.Name this key as ActiveDesktop and then press Enter.Click on the ActiveDesktop key. Add and select New > DWORD (32-bit) Value.Name the value as NoChangingWallPaper and then press Enter. NoChangingWallPaper value and set its Value data to 1. Click OK

RESULT: SAME AT ATTEMPT 1 - ieRemoves access to change wallpaper BUT ALSO blocks the wallpaper slideshow - the wallpaper just remains on the wallpaper it was on right before this solution was enabled.

ATTEMPT 3: Group Policy Editor v2

Type gpedit.msc and press OK to open the Local Group Policy Editor.Navigate to User Configuration > Administrative Templates > Desktop > Desktop.Double-click the Desktop Wallpaper option.In the next window, select the Enabled option

RESULT: It forces you to select just one wallpaper - not a series of wallpapers therefore not what I need