Desktop wallpaper

I've just recently removed some adware form my PC and now I realized that the wall paper on the desktop of one of the the USER is just white. If I right click on the desk and go to properties it shows a pop up window with tab General and a path to a file.
while if I go to control Panel and select dissplay it shows that I've selected a background but once you select another, the screen flashes and shows the selected one momentarily then goes back to white. I know this has to do with the adware removal as it had changed the backgronud for that user logon.

any suggestion!!!

Anyone???