Okay I'm a newbie, be gentle

Here are the specs running Windows XP Professional Edition SP-1, on a Pentium 4 1.8ghz, with an ATI All-In-Wonder 8500 DV Card, with latest drivers, also Norton Anti-Virus 2003 is running in the background. everytime I play a game such as Unreal Tournament, Deus Ex, Simcity 4, etc, after exiting the game I return to my desktop and all of a sudden the Desktop Background Picture disappears and I have to do a refresh (right click, refresh) in order for it to come back, this is somewhat annoying, is this a driver issue? or a general XP issue? Is there a fix for it?
-Thanks