ok heres one stupid idea.. plss.. dun flame..
u know ur taskbar?.. pull it up.. take a screenshot of the desktop and save it as a pic
then.. open conquer.. tg.. bot or something then after that.. unlock ur taskbar and pull it down..
then apply the screenshot as wallpaper as simple as that if u dont understand i can post screeny tut when i have time..
hopefully it doesnt need admin prvilage(duno how to spell) to change wallpapers