[anna leah jacobson]"Can I copy and stretch it out to its original glory?"
what do you mean by that. If your project is wrong, every copy will be wrong.
This can be several things, you made a mistake in encoding or authoring, we don't know what you did so we cannot help you unless you post info.
Your DVD player is set wrong. If you image looks like it is squish into a 4:3 box, everything is tall and skinny on the software player (and in simulator) you are doing something wrong. If it looks right on the computer but wrong on a player it maybe the player's settings.
Michael is correct. You may be able to simply change the aspect ratio setting for each track that should be widescreen, setting it to "16:9 widescreen" and any DVD player should play it back correctly.
If that doesn't solve the problem, you'll have to investigate further to find the point in your workflow that needs adjustment.