I have the following solution on my computer:
at
http://www.screenpaver.com/ you can download a screensaver, which makes a slideshow of pics in any files you tell it.
Shall I mention that my "Meat file" contains a little over 2000 pics (that much?! I cannot believe it)
The programm is shareware, but the only "problem" when you don't register, every 10th pic is the logo of screenpaver- that shouldn't disturb you
Have fun
Yvonne