I’ve downloaded and installed http://fourmilab.ch/slidescr/ to one of the house computers, it was on the list from the alfredtwo. I don’t like it for the house as it does not handle sub directories, and I have my photos arranged in subs.
I think it might be a good choice for school, and I could also download and tweak it to make it work better for the house but ….
I’ve seen a Visual Basic application that looks interesting.