I can't update my iphoto

I updated to mac os x (i think, dont know how to check what I updated to...) and now my iPhoto doesnt work because it needs to be updated. But I can't update it because when the pop-up comes up it doesnt let me change my email adress (the one that it already written down there I dont use) but everywhere else I use my new email adress. Im even "logged in" to app store with my new email but as soon as I wanna update the iPhoto it asks me for my old email (and that one doesnt exsist anymore.

HELP!