I think Pro Show Gold will let you add video as well as your photos . In any case ,any video Editing package , I use Pinnacle , Sony Vegas ,Serif Movie Plus and a host of others that allow you to add photos onto the timeline aswell as video and it will encode it ready to put it on to DVD.
Mind you , not all video packages will work with wmv files .I think Movie Plus does though .What I've done in the past is create a movie with the pictures , so you would end up with 2 video files and use Sonic DVDit . This is a very good authoring program , lets you import most formats onto your page ,it then encodes and writes directly to disk .HTH