I bought explore Human anatomy professional edition the 12 CD collection but I am very disappointed because only 6 of the 12 CDs are installing on xp. Even after they and sent me a third CD to try it didn't work. I got the message it is not compatible with windows xp. I thought it was compatible with xp because it says so on the package. It seems I was fooled buy the makers of professional edition of explore Human anatomy. Please buy something else if you have windows xp if not you will regret it.