Zoombinis Logical Journey and Oregon Trail II by The Learning Company and Math Blaster by Knowledge Adventure were computer games that most of my students enjoyed.  Zoombinis teaches problem solving and logic math skills.  Math Blaster has an assortment of math programs depending on what skill level is desired to teach math facts.  Oregon Trail II teaches students the importance of good planning, hardships encountered on the trail, history, geography, and more.  All three programs offer learning in a fun setting for kids.  Please check to make sure that these games are compatible to your computer or check for updated versions.