It is unlikely that someone "cleaning up" a computer would change the settings in the programs- But highly likely that they would adjust to the monitor being used. Since most repair places have large monitors, they would see the larger icons as too large, and reset the screen to a higher resolution. That would affect both the icon size, print size , and games. Thus my advice, to restore the system to the original settings. As the best setting is dependent on the monitor size ( and capabilities) I would not go sa far as to specify any specific values.