Welcome to MyCE, PollyVillalobos!
If the DVD is a "slideshow" style, where the pictures cycle from one to the next as the DVD plays back,
Go here: videolan.org
and download VLC Media Player (it's free), then play the DVD in VLC.
When you get to the picture (frame) you want, pause it, click on VIDEO @ the top of the player (or right-click on the video screen) & choose SNAPSHOT. VLC will save the snapshot as a jpeg in MY DOCUMENTS by default, although you can change the destination in SETTINGS.