Most DVD's need to be authored to properly playback on a standalone DVD player and PD does this for you so you don't have to really produce a video first in some format.
I'd simply go to the "Create Disc" tab, once there click on "Menu Preferences" and scroll through the list and select "No Menu", on the "2D Disc" tab, make sure DVD is selected, then select "Burn in 2D" in the lower right corner and burn your DVD.
The "No Menu" option will simply play the DVD in the standalone player once inserted.
Jeff