Hi - I've posted elsewhere but I think I posted in the wrong place! Briefly - totally new iMac delivered last night, main thing I wanted to do was to use iPhoto, and also to download Serif Photoplus Starter Edition. So, downloaded Serif, but all that opens is a box with some strange characters on it and iPhoto tells me that I already have something open (can't remember what it says) and therefore I need to try to press control / command and option - did that, got a load of messages about repairing, so tried all those... all to no avail! Now I'm v v new to mac, so please bear with me! Thanks!