Windows

This would likely do the job. Also, Windows Movie Maker.

Realize also that your options depend on whether this DVD is meant to be played on a computer with the same software, or if it is meant to be playable in any DVD player. How you build the show will depend on this.

You could even use Google's Picasa - just make a movie of the images, causing each image to display for whatever amount of time you like. Save the movie, then burn it to DVD. (Again, the format you burn to the DVD will depend on what the DVD players are capable of - can they play only DVD, or do they play other formats (AVI, MPEG, etc.).