I had the same problem with my computer display options. I also had only the largest icons. I re-installed my video drivers and that fixed it. I had an application recovery CD that come with my computer and went into that and re-installed all the video drivers.
Hope that helps.
my computer's video display is set at 16 color and i can't change it.its options are just 16 color and 2 color,and i want to set it at ,at about 16 bits or 256 color but it won't let me.