Thanks for the help, but it mentions about screen saver on the post you mentioned. I don't use a screen saver.
The problem I have is. If I have a folder with some pictures in (from my digital camera) for example. When I go to view/play the pictures as a slideshow, I get the error that I mentioned earlier.
I will however try what is mentioned in post 11 tomorrow, as I'm typing this on my iPad.
Thanks again, really appreciate the help.