Microsoft CFS 3
 

I too purchased athe CFS 3 and it won't work on my puter...took it back and they said I need more memory..OK,installed more memory and it still won't work...Took a look at the back of the box it came in and it needs 900 mb of Ram..my system is not that high in Ram,so they checked it out and said they couldn't add anymore Ram to my system..I do have CFS 1,and 2..no problems..seems as if you don't have alot of Ram or memory, forget it..it won't work....