I think that scanner icons do move after they've been scanning. Why not have the icon on the task bar at the bottom of the screen where you can always see it or right click desktop and try locking items in place.
Icon Restore as suggested by Burr Walnut is the answer. I use it all the time. Its particularly useful if you have used Safe Mode and your desktop is totally messed up. It puts everything back where it was before.
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