Windows Vista & Lumix simple viewer
I agree. It runs fine on my Vista machine, although I don't run Lumix simple viewer no more for other reasons. I just 'Hate' the way it formats directory names! And the fact that you can't change it!
Of course I also have that user security thing turned off too (I have my reasons...stupid VB6 how I hate you.) so that could be a reason it works on my machine...though I doubt that very much. You may want to simply re-install it...