Toyhide

Recently my normal desktop background picture that I have used for years (Webshots)is being displaced by something that has installed itself as the default desktop: toyhide. This comes up as background when I bootup. It is the Windows XP screen showing the Home Edition title (whatever that is called). Some times the background is the large flying Window (grey). When I look at the properties/desktop the name showes up as 'toyhide'. I cannot find anything on my computer by that name and if I change the desktop background to Webshots, the 'toyhide' name disappears as an option on the list.
What is going on? Has Microsoft slipped in the 'toyhide' in an upgrade, of which I have installed many as they become available.
How can I get rid of this 'toyhide' picture(s)??