If you embed a Word table, or paste a picture of a Word table, the borders on that table may not look right. This is usually because you are working in PowerPoint's Normal view, and the zoom is "zoomed out" so that you can't see all the detail on the slide. Before you panic that the borders have been destroyed, click the Slide Show button to view the slide full screen. Chances are good you'll see the borders are, in fact, still there.