Ok, here is my problem, I attempted to downloaded (not sure that is the correct term) iPhoto from my back up onto my mother's mac mini (it's a long story why i did this). When I tried to open iPhoto it would not open - I've taken a screenshot of what the computer told me. Anyway, I gave up. But NOW! My mother can't open her iPhoto. she gets the same dialog box when she tries to open. We have restored iPhoto from her back up and the same thing keeps happening. Noooo! Please, please help, thank you. Of course, I will provide any information that will help. Thank you. Oh, I've tried holding down common option while opening the app. Nothing happens. Same story - it doesn't open and the dialog box pops up.