Just installed that virtual desktop thingy. Maybe I'm stupid or something but if I change the wallpaper for desktop #1 then go to desktop #2 and come back to #1, the wallpaper has changed to the default... argh.. what do I do wrong?
Are you using the normal desktop configuration tool? If so, try right-clicking on the text by the 4 desktops on the taskbar and selecting "configure desktop manager" (or something like that...im not at my XP pc). The window that opens will show a box with your 4 desktops. click one and change the background from there.
Virtual desktop = buggy. If you run it for a while it invariably crashes. If you are looking for the best multi-desktop tool checkout "MulitDesk" - works under nt/2k/xp perfectly and is pretty configurable.