I used to have 2.3.1 installed. But I uninstalled it before installing 2.4. I don't believe that I ever had both of them installed on my computer at the same time. In fact I believe that there was a semester between uninstalling 2.3.1 and 2.4, but I am not sure of that. Is this something that I can fix or do I just celebrate that I "won" the game, scrub my computer of 2.4, and re-install? Thanks for your help.