Combine Video and Photos into a solid clip

I'm looking for software that can do one of two things. It can either take a directory full of photos and videos and play them in a slideshow type loop, or can combine photos and video in a single file, movie, .exe, etc for playback on a computer connected to a TV for a trade show. I'd also prefer free, if possible.

We have a week long trade show coming up, and would like to put new photos and videos in a directory each night, and have the software start to play all of the content, like a slideshow, in a continuous loop. Then, each night, we could stop the software, update the content, then restart it...or replace the single movie file or exe with an updated one.

Any suggestions?

I'll check that out. Thanks!