Hi there, I've searched for the solution to this problem but I can't quite find it. I'm trying to install Photoshop CS4 (regular, didn't have the money for extended) and it doesn't let me. Perhaps it's the amount of available HD space on my laptop. There are 4.3 GB of HD space left on this MacBook (2,1). Anyone know what's going on? The program says it's already installed, I believe.