Desktop Backgrounds- Have lost the ability to load, install and display additional images
 

When I browse to an image I would like to use for a desktop select it and
click it will not load or display in the Display Properties dialog box nor
will it display on the desktop.
I have even tried by coping selected images into the
C:\WINDOWS\Web\Wallpaper, which I have done before, they are still not
displayed.
I have routinely stored images I want to use for a desktop background in the
C:\WINDOWS\Web\Wallpaper and have been able to use them at will.
Prior to reloading this particular machine I was able to use any image I
wanted to.

Can anyone give tips on what might be wrong.

The reload was with an original XP SP3 disk.