I originally set up my profile on the Apple Store many years ago. Since then, Ive changed my email address and password several times. Yet even though Ive gone into Apple Store preferences and changed my profile to the current settings, it still, it seems by default, brings up a box with my original email address and PW every time I attempt to update Apple Apps. Today, it allowed me to install a security update for IOS, but won't let me update programs like iPhoto, and others as well. I have a late 2009 iMac, IOS 10.10.1 Yosemite, Memory 12 meg, and a 1 Tbyte HDD. Any suggestions?