Hi Joe,
Rather than pasting borders from Word (which are probably text boxes with
the lines formatted differently) why don't you use PowerPoint's own borders?
You'll find them by clicking on insert, picture, clip art and enter borders
for your search criteria. You'll find a lot more options. Or insert a text
box and size it to cover your slide to the edge, then right click on the box
and select format and change the fill color to none and the lines to
whatever you want your border to look like.
HTH,
Glenna