Mark is frustrated that his icons on his laptop keep moving around after he gets them set up how he wants. Leo says if he's attached a monitor at some point, that'll happen. He suspects that the preferences in Mark's account is corrupt. He suggests creating a new profile and logging into it. If the same thing happens again, then Mark knows that the preferences are corrupt and there may be other issues as well. It may need to have Windows repaired from the install disk.
If he's feeling bold, here's a registry edit that could help.