This type of recovery can be quite difficult, would be best to restore a previously saved system image, if there was one made.
It might be best to check with the laptop owner, your cousins son, if he has a backup image.
You could direct him to this thread so he can see the recommendations made, possibly he can use them to recover his previous settings and data.
At this point I would try to save the windows.old file for him to have the chance to use, if he wants to.