hello, first of all I had the same problem with the trial version of adobe photoshop cs6 then cs5
I tried cs6 first, it happened, when I use loading files into stack it takes 5 minutes or so to load my images, even if they were 5 or less, after it loads and when I choose a tool or an option it freezes and never recovers again at all. It just freezes and I have to shut it down. I un-installed it then began to use the trial version of cs5, it happened again. I don't know what's happening, this is just a fresh laptop I just bought, my previous one was pretty old and it ran the photoshop without any problems at all.
Thank you.